Data Sheet - Analog Devices
LT1637 1.1MHz, 0.4V/µs Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO
U
FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250µA Supply Current Max Operating Temperature Range: – 55°C to 125°C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/µs Low Input Offset Voltage: 350µV Max Single Supply Input Range: – 0.4V to 44V High Output Current: 25mA Min Specified on 3V, 5V and ±15V Supplies Output Shutdown Output Drives 4700pF with Output Compensation Reverse Battery Protection to 25V High Voltage Gain: 800V/mV High CMRR: 110dB Available in 8-Lead MSOP, PDIP and SO Packages; and a Tiny (3mm × 3mm × 0.8mm) DFN Package
U APPLICATIO S
■ ■ ■ ■
Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters
The LT1637 has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode, even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 22V. There is no phase reversal of the output for inputs 5V below VEE or 44V above VEE, independent of VCC. The LT1637 op amp is available in the 8-pin MSOP, PDIP and SO packages. For space limited applications, the LT1637 is available in a 3mm × 3mm × 0.8mm dual fine pitch leadless package (DFN). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
U
■
The LT®1637 is a rugged op amp that operates on all single and split supplies with a total voltage of 2.7V to 44V. The LT1637 has a gain-bandwidth product of 1.1MHz while drawing less than 250µA of quiescent current. The LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3µA. The LT1637 is reverse supply protected: it draws virtually no current for reverse supply up to 25V. The input range of the LT1637 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1637 can drive heavy loads; its rail-to-rail output drives 25mA. The LT1637 is unity-gain stable into all capacitive loads up to 4700pF when optional 0.22µF and 150Ω compensation is used.
TYPICAL APPLICATIO
Over-The-Top® Current Source with Shutdown Current Source Timing
Switchable Precision Current Source
6V
4V TO 44V
+ 4.7µF
VSHDN
LT1004-1.2 2k
4V 2V
R
0V
R*
+ LT1637
TP0610
– IOUT SHDN
10mA
IOUT = 1.2 R e.g., 10mA = 120Ω
*OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R
IOUT 5mA
0mA
1637 TA01
100µs/DIV
1637 TA01b
1637fd
1
LT1637
U
W W
W
ABSOLUTE
AXI U RATI GS
(Note 1)
Total Supply Voltage (V + to V –) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... ±25mA Shutdown Pin Voltage Above V – ..................................... 32V Shutdown Pin Current ........................................ ±10mA Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range (Note 3) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C LT1637MP ......................................... –55°C to 125°C
Specified Temperature Range (Note 4) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C LT1637MP ......................................... –55°C to 125°C Junction Temperature ........................................... 150°C Junction Temperature (DD Package) ................... 125°C Storage Temperature Range ................. – 65°C to 150°C Storage Temperature Range (DD Package) ....................................... – 65°C to 125°C Lead Temperature (Soldering, 10 sec).................. 300°C
U W U PACKAGE/ORDER I FOR ATIO TOP VIEW
TOP VIEW
NULL 1
8
NULL
–IN A 2
7
V+
+IN A 3
6
OUT
V– 4
5
SHDN
DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/W (NOTE 2)
TOP VIEW NULL –IN +IN V–
1 2 3 4
8 7 6 5
NULL 1
8
NULL
–IN 2
7
V+
+IN 3
6
OUT
V– 4
5
SHDN
NULL V+ OUT SHDN
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W
N8 PACKAGE S8 PACKAGE 8-LEAD PDIP 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W (N8) TJMAX = 150°C, θJA = 190°C/W (S8)
UNDERSIDE METAL CONNECTED TO V –
ORDER PART NUMBER
DD PART* MARKING
ORDER PART NUMBER
MS8 PART* MARKING
LT1637CDD LT1637IDD
LAAK LAAK
LT1637CMS8 LT1637IMS8
LTIE LTIE
ORDER PART NUMBER
S8 PART MARKING 1637 1637I 1637H 1637MP
LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 LT1637HS8 LT1637MPS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
UNITS
100
350 550 700
µV µV µV
100
350 750 1100
µV µV µV
125
550 950 1100
µV µV µV 1637fd
2
LT1637
U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
IOS IB
PARAMETER Input Offset Voltage Drift (Note 9)
LT1637C/LT1637I MIN TYP MAX 1 3 2 6 2 6
CONDITIONS N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DDPackage, – 40°C ≤ TA ≤ 85°C
● ● ● ● ●
0.4
VCM = 44V (Note 5)
6.0 2.5
nA µA
● ●
20 23 0.1
50 60
nA µA nA
Input Offset Current Input Bias Current VCM = 44V (Note 5) VS = 0V
UNITS µV/°C µV/°C µV/°C
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential Common Mode, VCM = 0V to 44V
2.6 1.4
MΩ MΩ
CIN
Input Capacitance
4
pF
Input Voltage Range
1 0.7 ●
0
44
V
CMRR
Common Mode Rejection Ratio (Note 5)
VCM = 0V to (VCC – 1V) VCM = 0V to 44V (Note 8)
● ●
88 80
110 98
dB dB
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C VS = 3V, – 40°C ≤ TA ≤ 85°C
150 100 75
400
● ●
V/mV V/mV V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C VS = 5V, – 40°C ≤ TA ≤ 85°C
300 200 150
800
● ●
V/mV V/mV V/mV
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA
● ● ●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load VS = 3V, ISOURCE = 5mA
● ●
2.94 2.25
2.975 2.67
V V
VS = 5V, No Load VS = 5V, ISOURCE = 10mA
● ●
4.94 3.80
4.975 4.45
V V
VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC
10 15
14 45
mA mA
VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC
15 15
22 60
mA mA
90
98
dB
25
40
ISC
PSRR
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
VS = 3V to 12.5V, VCM = VO = 1V
●
Minimum Supply Voltage Reverse Supply Voltage IS
ISHDN
●
3 325 580
IS = – 100µA
Supply Current (Note 6)
●
8 700 1300
2.7
mV mV mV
V V
190
250 295
µA µA
●
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
3
12
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V
● ●
0.2 1.0 2.5 4.3
15 5
nA µA µA µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
0.02
1
µA 1637fd
3
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –, VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
LT1637C/LT1637I MIN TYP MAX
PARAMETER
CONDITIONS
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
tON
Turn-On Time
VPIN5 = 5V to 0V, RL = 10k
45
µs
tOFF
Turn-Off Time
VPIN5 = 0V to 5V, RL = 10k
3
µs
tSETTLING
Settling Time
0.1% AV = 1, ∆VO = 2V
9
µs
GBW
Gain-Bandwidth Product (Note 5)
f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
650 550 500
1000
● ●
kHz kHz kHz
Slew Rate (Note 7)
AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
0.210 0.185 0.170
0.35
● ●
V/µs V/µs V/µs
SR
●
20
150
UNITS µA
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DD Package, – 40°C ≤ TA ≤ 85°C
Input Offset Voltage Drift (Note 9)
IOS
Input Offset Current
IB
Input Bias Current
UNITS
100
450 650 800
µV µV µV
100
450 800 1150
µV µV µV
125
650 1000 1150
µV µV µV
● ● ●
1 2 2
3 6 6
µV/°C µV/°C µV/°C
●
1
6
nA
17
50
●
nA
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential Common Mode, VCM = – 15V to 14V
3 2200
MΩ MΩ
CIN
Input Capacitance
1
4
Input Voltage Range
●
– 15
pF 29
V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 29V
●
80
110
dB
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
100 75 50
400
● ●
V/mV V/mV V/mV
No Load ISINK = 5mA ISINK = 10mA
● ● ●
VOL
Output Voltage Swing LOW
– 14.997 – 14.680 – 14.420
– 14.95 – 14.25 – 13.65
V V V 1637fd
4
LT1637
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOH
Output Voltage Swing HIGH
No Load ISOURCE = 5mA ISOURCE = 10mA
● ● ●
14.9 14.2 13.7
14.967 14.667 14.440
V V V
ISC
Short-Circuit Current (Note 2)
Short Output to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
±25 ±20 ±15
±31.7
● ●
mA mA mA
VS = ±1.5V to ±22V
●
90
115
dB
PSRR
Power Supply Rejection Ratio
IS
±1.35
V
230
300 370
µA µA
●
Minimum Supply Voltage Supply Current
●
ISHDN
UNITS
Positive Supply Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
6
40
µA
Shutdown Pin Current
VPIN5 = – 21.7V, VS = ±22V, No Load VPIN5 = – 20V, VS = ±22V, No Load
● ●
0.3 0.9
15 8
nA µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
20
150
µA
0.02
2
µA
Output Leakage Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
tON
Turn-On Time
VPIN5 = – 10V to – 15V, RL = 10k
35
µs
tOFF
Turn-Off Time
VPIN5 = – 15V to – 10V, RL = 10k
3
µs
GBW
Gain-Bandwidth Product
f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
750 650 600
1100
● ●
kHz kHz kHz
AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
0.225 0.200 0.180
0.4
● ●
V/µs V/µs V/µs
SR
Slew Rate
– 21.7
– 21.6 – 20.8
V –20.0
V
1637fd
5
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP MIN TYP MAX
CONDITIONS
100 ●
IOS IB
UNITS
450 3
µV mV
Input Offset Voltage Drift (Note 9)
●
10
µV/°C
Input Offset Current VCM = 44V (Note 5)
● ●
15 10
nA µA
VCM = 44V (Note 5)
● ●
150 100
nA µA
44
V
Input Bias Current Input Voltage Range
CMRR
Common Mode Rejection Ratio (Note 5)
VCM = 0.3V to (VCC – 1V) VCM = 0.3V to 44V
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k
3
●
0.3
● ●
72 74 150 20
400
●
V/mV V/mV
300 35
800
●
V/mV V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
dB dB
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA
● ● ●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load VS = 3V, ISOURCE = 5mA
● ●
2.90 2.05
V V
VS = 5V, No Load VS = 5V, ISOURCE = 10mA
● ●
4.90 3.50
V V
VS = 3V to 12.5V, VCM = VO = 1V
●
80
dB
●
2.7
V
●
23
V
PSRR
Power Supply Rejection Ratio Minimum Supply Voltage
IS
ISHDN
GBW SR
Reverse Supply Voltage
IS = – 100µA
Supply Current
(Note 6)
15 900 1500
mV mV mV
●
250 400
µA µA
190
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
15
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5)
● ●
200 7
nA µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
5
µA
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
●
200
µA
Gain-Bandwidth Product
f = 10kHz (Note 5)
Slew Rate
650 350
1000
●
kHz kHz
0.210 0.1
0.35
●
V/µs V/µs
AV = – 1, RL = ∞ (Note 7)
1637fd
6
LT1637
±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V –, unless otherwise specified. (Note 4) SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP MIN TYP MAX
CONDITIONS
100 ●
UNITS
550 3.4
µV mV
Input Offset Voltage Drift (Note 9)
●
11
µV/°C
IOS
Input Offset Current
●
25
nA
IB
Input Bias Current
●
250
nA
CMRR
Common Mode Rejection Ratio
VCM = –14.7V to 29V
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k
3
●
72
●
100 4
Output Voltage Swing
No Load IOUT = ±5mA IOUT= ±10mA
● ● ●
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to 22V
●
84
●
±1.35
Minimum Supply Voltage Supply Current
V V V dB V
230 ●
ISHDN
V/mV V/mV ±14.8 ±14.0 ±13.4
VO
IS
dB 400
300 500
µA µA
Positive Supply Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
60
µA
Shutdown Pin Current
VPIN5 = –21.7V, VS = ±22V, No Load VPIN5 = –20V, VS = ±22V, No Load
● ●
200 10
nA µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
200
µA
Output Leakage Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
100
µA
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
–21.7
V
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
–20
GBW
Gain-Bandwidth Product
f = 10kHz
750 400
1100
●
kHz kHz
0.225 0.1
0.4
●
V/µs V/µs
SR
Slew Rate
AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. The θJA specified for the DD package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. Note 3: The LT1637C and LT1637I are guaranteed functional over the operating temperature range of – 40°C to 85°C. The LT1637H is guaranteed functional over the operating temperature range of –40°C to 125°C. The LT1637MP is guaranteed functional over the operating temperature range –55°C to 125°C. Note 4: The LT1637C is guaranteed to meet specified performance from 0°C to 70°C. The LT1637C is designed, characterized and expected to meet
V
specified performance from – 40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1637I is guaranteed to meet specified performance from – 40°C to 85°C. The LT1637H is guaranteed to meet specified performance from –40°C to 125°C and the LT1637MP is guaranteed to meet specified performance from –55°C to 125°C. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V or VS = ±22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V or VS = ±22V tests. Note 7: Guaranteed by correlation to slew rate at VS = ±15V and GBW at VS = 3V and VS = ±15V tests. Note 8: This specification implies a typical input offset voltage of 650µV at VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V. Note 9: This parameter is not 100% tested.
1637fd
7
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage
300 TA = 125°C
200
TA = 25°C
150
TA = –55°C
100 50 0
40
300
30
200 100 0
TA = 125°C
–100 TA = –55°C
–200 –300
10 20 30 40 TOTAL SUPPLY VOLTAGE (V)
0.08
0.04
1 2 3 4 TOTAL SUPPLY VOLTAGE (V)
5
4
1
Output Saturation Voltage vs Input Overdrive
10 OUTPUT SATURATION VOLTAGE (V)
TA = 25°C TA = – 55°C
0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA)
100
100
VS = 5V, 0V VOD = 30mV 1
0.1 TA = 125°C TA = 25°C
0.01
TA = – 55°C
0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA)
1637 G04
3
4 5 6 TIME (s)
7
8
50 40 30
9
10
1637 G07
OUTPUT HIGH
20 10
OUTPUT LOW 0
10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
Input Noise Current vs Frequency 1.4 INPUT NOISE CURRENT DENSITY (pA/√Hz)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
NOISE VOLTAGE (200nV/DIV)
2
60
Noise Voltage Density vs Frequency VS = ±15V 60
50
40
30
20
1
70
1637 G06
70
0
80
0
100
VS = 5V, 0V NO LOAD
90
1637 G05
0.1Hz to 10Hz Noise Voltage VS = ± 2.5V
4.2 4.4 4.6 4.8 5 10 20 30 40 50 COMMON MODE VOLTAGE (V) 1637 G03
Output Saturation Voltage vs Load Current (Output Low)
TA = 125°C
TA = 25°C
0
1637 G02
Output Saturation Voltage vs Load Current (Output High)
0.1
TA = 125°C
0.04
0.08
0
VS = 5V, 0V VOD = 30mV
TA = –55°C
0.12
TA = 25°C
1637 G01
OUTPUT SATURATION VOLTAGE (V)
10
–400 0
VS = 5V, 0V
20
OUTPUT SATURATION VOLTAGE (mV)
SUPPLY CURRENT (µA)
350
400
INPUT BIAS CURRENT (µA)
CHANGE IN INPUT OFFSET VOLTAGE (µV)
400
250
Input Bias Current vs Common Mode Voltage
Minimum Supply Voltage
1
10 100 FREQUENCY (Hz)
1000 1637 G08
VS = ±15V
1.2 1.0 0.8 0.6 0.4 0.2 0 1
10 100 FREQUENCY (Hz)
1000 1637 G09
1637fd
8
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain and Phase Shift vs Frequency
Gain-Bandwidth Product vs Temperature
VS = ±2.5V
80
PHASE
40
60
30
40 GAIN
20
20
10
0
0
PHASE SHIFT (DEG)
GAIN (dB)
50
100
–10 –20
1300
0.7
1200
0.6
1000
–30 1k
10k 100k FREQUENCY (Hz)
VS = ±15V
1100
VS = ±1.5V
900
700 – 50 –25
1M
50 25 75 0 TEMPERATURE (°C)
100
1637 G10
50 PHASE MARGIN 45 40 GAIN BANDWIDTH
1100
35
1050
30
5
10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V)
45
COMMON MODE REJECTION RATIO (dB)
1250
0
25
80 VS = ±15V
70 60
VS = ±1.5V
50 40 30 20 10
50 75 25 TEMPERATURE (°C)
100
70 60 POSITIVE SUPPLY
50 40 30
NEGATIVE SUPPLY
20 10 0
10k 100k FREQUENCY (Hz)
1M
1k
10k 100k FREQUENCY (Hz)
1M 1637 G15
Undistorted Output Swing vs Frequency
Output Impedance vs Frequency 10k
35 VS = ± 2.5V
30
PHASE MARGIN
125
VS = ± 2.5V
80
1637 G14
45
Vs = ±15V
DISTORTION ≤ 1% AV = 1
1100
35
1000
30 GAIN BANDWIDTH
900
25
800
20
700
100
AV = 100
10
AV = 10
1
AV = 1
OUTPUT SWING (VP-P)
40
OUTPUT IMPEDANCE (Ω)
1k
1200
10 100k 1637 G16
0.1 100
1k
25 20 15 10 5
15 10k LOAD RESISTANCE (Ω)
0
–10 1k
50 VS = ± 2.5V
– 25
1637 G12
0
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
1400
1k
FALLING, VS = ±1.5V
PSRR vs Frequency
90
Gain-Bandwidth Product and Phase Margin vs Load Resistance
600
0.3
90
1637 G13
1300
FALLING, VS = ±15V
0.1 – 50
125
100
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
55
1150
RISING, VS = ±1.5V
0.4
CMRR vs Frequency
1300
1000
0.5
1637 G11
Gain-Bandwidth Product and Phase Margin vs Supply Voltage
1200
RISING, VS = ±15V
0.2
800
POWER SUPPLY REJECTION RATIO (dB)
60
Slew Rate vs Temperature
SLEW RATE (V/µs)
120 GAIN-BANDWIDTH PRODUCT (kHz)
70
10k 100k FREQUENCY (Hz)
1M 1637 G17
0 100
Vs = ± 2.5V
1k 10k FREQUENCY (Hz)
100k 1637 G18
1637fd
9
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling, Overshoot vs Capacitive Load
Settling Time to 0.1% vs Output Step 100
VS = ±15V
8
90 80
AV = – 1
AV = 1
OVERSHOOT (%)
OUTPUT STEP (V)
6 4 2 0 –2 –4 AV = 1
–6
10 VS = ±2.5V NO OUTPUT COMPENSATION
AV = – 1
AV = 1
60
AV = 5
50 AV = 10
40 30 20
–8
VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k
1
AV = 2
70
THD + NOISE (%)
10
Total Harmonic Distortion + Noise vs Frequency
0.1
0.01 AV = –1
0.001
AV = 1
10
–10 0
10
0
30 20 SETTLING TIME (µs)
40
0.0001 10
100 1000 CAPACITIVE LOAD (pF)
10000
Total Harmonic Distortion + Noise vs Load Resistance 10
VS = 3V, 0V VIN = 0.6V TO 2.4V
0.01
1637 G21
RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = –1, RG = 100k
1 THD + NOISE (%)
THD + NOISE (%)
0.1
100k
Total Harmonic Distortion + Noise vs Output Voltage
VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz
VS = ±1.5V VIN = ±0.9V
1k 10k FREQUENCY (Hz)
1637 G20
1637 G19
1
100
10
0.001
AV = 1 VS = 3V, 0V
AV = –1 VS = ±1.5V AV = 1 VS = ±1.5V
0.1
AV = 1 VS = 3V, 0V
0.01 VS = 3V, 0V VIN = 0.3V TO 2.1V
AV = –1, VS = 3V, 0V
0.001
0.0001 100
1k 10k LOAD RESISTANCE TO GROUND (Ω)
0
100k
1 2 OUTPUT VOLTAGE (VP-P)
1637 G23
1637 G22
CHANGE IN INPUT OFFSET VOLTAGE (50µV/DIV)
Open-Loop Gain
Large-Signal Response
Small-Signal Response
VS = ±15V AV = – 1
VS = ±15V
VS = ±15V AV = 1
10V
A A
B C
3
50mV B C – 50mV
A: RL = 2k B: RL = 10k C: RL = 50k –10V 0V 10V OUTPUT VOLTAGE (5V/DIV)
– 10V
1637 G24
1637 G25
1637 G26
1637fd
10
LT1637
U
W
U
U
APPLICATIO S I FOR ATIO Supply Voltage
The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1637 is protected against reverse battery voltages up to 25V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. When operating the LT1637 on total supplies of 30V or more, the supply must not be brought up faster than 1µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. 5Ω of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1637 has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.9V or more below V +, the PNP input stage is active and the input bias current is typically – 20nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1637 to operate with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 23µA at room temperature. The input offset voltage is typically 600µV when operating above V +. The LT1637 will operate with its input 44V above V – regardless of V +.
The inputs are protected against excursions as much as 22V below V – by an internal 1.3k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 5V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1637 is affected by input overdrive as shown in the typical performance curves. When monitoring input voltages within 100mV of V +, gain should be taken to keep the output from clipping. The output of the LT1637 can be pulled up to 25V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. The LT1637 is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 4700pF, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1637 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1637 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.9V). See the Typical Performance Characteristics curves.
1637fd
11
LT1637 U
U
W
U
APPLICATIO S I FOR ATIO
The shutdown pin can be taken up to 32V above V –. The shutdown pin can be driven below V –, however the pin current through the substrate diode should be limited with an external resistor to less than 10mA.
Gain The open-loop gain is less sensitive to load resistance when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details.
Input Offset Nulling The input offset voltage can be nulled by placing a 10k potentiometer between Pins 1 and 8 with its wiper to V – (see Figure 1). The null range will be at least ±3mV.
Shutdown The LT1637 can be shut down two ways: using the shutdown pin or bringing V + to within 0.5V of V –. When V + is brought to within 0.5V of V – both the supply current and output leakage current drop to less than 10nA. When the shutdown pin is brought 1.2V above V –, the supply current drops to about 3µA and the output leakage current is less than 1µA, independent of V +. In either case the input bias current is less than 0.1nA (even if the inputs are 44V above the negative supply).
LT1637 8 1 10k
V–
1637 F01
Figure 1. Input Offset Nulling
W W SI PLIFIED SCHE ATIC 7 V+ Q1
Q13 D1
– IN
SHDN 10µA
Q25 Q23
R3 1.3k
R2 6k 5
Q19
D2
2
Q2
R1 1M
D3 Q21
R4 1.3k + IN
Q9
Q10
Q14 Q15
Q18
Q20
Q24 6 OUT
Q22
3 Q11
Q12
Q17
Q16
Q26
Q3 Q4 Q5
Q6 Q7
Q8
D4
D5
NULL
R5 7k
R6 7k
R7 400Ω
R8 400Ω
1
8 NULL
4 V– 1637 SS
1637fd
12
LT1637
U
TYPICAL APPLICATIO S Optional Output Compensation for Capacitive Loads Greater Than 200pF
Positive Supply Rail Current Sense 5V
+
VIN
200Ω
LT1637 CL ≤ 4700pF
– 0.2Ω
+
LOAD
Q1 2N3904
LT1637
200Ω
–
0.22µF
0V TO 4.3V
150Ω
2k
ILOAD
1637 TA03 1637 TA02
VOUT = (2Ω)(ILOAD)
Lamp Outage Detector 3V
5V TO 44V 1M LAMP ON/OFF
100k 5k 0.5Ω
– LT1637
OUT
+
OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB 1637 TA05
Over-The-Top Comparator with Hysteresis
Over-The-Top Current Sense 3V TO 44V R1 200Ω
1M 3V TO 44V IN1 (0V TO 44V)
10k
3V
+ VOUT
LT1637
–
RS 0.2Ω
+ LT1637
1M
– 1M
2N5087 IN2 (0V TO 44V)
10k
ILOAD
1M
LOAD V HYSTERESIS = CC 100
2N5210
ILOAD =
VOUT (RS)(R2/R1)
Q1 2N3904 VOUT (0V TO 2.7V) R2 2k 1637 TA06
1637 TA04
1637fd
13
LT1637
U
PACKAGE DESCRIPTIO
DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5
0.38 ± 0.10 8
0.675 ±0.05
1.65 ± 0.10 (2 SIDES)
3.00 ±0.10 (4 SIDES)
3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES)
PIN 1 TOP MARK (NOTE 6)
PACKAGE OUTLINE
(DD) DFN 1203
0.75 ±0.05
0.200 REF
0.25 ± 0.05
4 0.25 ± 0.05
0.50 BSC 2.38 ±0.05 (2 SIDES)
1 0.50 BSC
2.38 ±0.10 (2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005)
5.23 (.206) MIN
3.20 – 3.45 (.126 – .136)
0.42 ± 0.038 (.0165 ± .0015) TYP
3.00 ± 0.102 (.118 ± .004) (NOTE 3)
0.65 (.0256) BSC
8
7 6 5
0.52 (.0205) REF
RECOMMENDED SOLDER PAD LAYOUT
0.254 (.010)
3.00 ± 0.102 (.118 ± .004) (NOTE 4)
4.90 ± 0.152 (.193 ± .006)
DETAIL “A” 0° – 6° TYP
GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A”
1
2 3
4
1.10 (.043) MAX
0.86 (.034) REF
0.18 (.007) SEATING PLANE
0.22 – 0.38 (.009 – .015) TYP
0.65 (.0256) BSC
0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
1637fd
14
LT1637
U
PACKAGE DESCRIPTIO
N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8
7
6
5
1
2
3
4
.255 ± .015* (6.477 ± 0.381)
.300 – .325 (7.620 – 8.255)
.065 (1.651) TYP
.008 – .015 (0.203 – 0.381)
(
+.035 .325 –.015 8.255
+0.889 –0.381
.130 ± .005 (3.302 ± 0.127)
.045 – .065 (1.143 – 1.651)
)
.120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076)
.100 (2.54) BSC
N8 1002
NOTE: 1. DIMENSIONS ARE
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3
.045 ±.005 .050 BSC 8
.245 MIN
7
6
5
.160 ±.005
.150 – .157 (3.810 – 3.988) NOTE 3
.228 – .244 (5.791 – 6.197)
.030 ±.005 TYP
1
RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254)
0°– 8° TYP
.016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN
.053 – .069 (1.346 – 1.752)
.014 – .019 (0.355 – 0.483) TYP
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2
3
4
.004 – .010 (0.101 – 0.254)
.050 (1.270) BSC
SO8 0303
1637fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1637
U
TYPICAL APPLICATIO S Sample-and-Hold 3V VIN
3V
+ +
LT1637
–
0.22µF
SHDN VSAMPLE
LT1636
150Ω
VOUT
–
3V
1637 TA07
0V DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
MUX Amplifier
MUX Amplifier Waveforms
5V VIN1 5kHz AT 4VP-P
+ VOUT
LT1637
–
VOUT 2V/DIV
SHDN
5V
–
INPUT SELECT 5V/DIV
LT1637 VIN2 10kHz AT 2VP–P
+
0.2ms/DIV
SHDN
1637 TA08
INPUT SELECT 1kHz AT 5VP–P 74HC04
1637 TA09
RELATED PARTS PART NUMBER
DESCRIPTION
COMMENTS
LT1078/LT1079 LT2078/LT2079
Dual/Quad 55µA Max, Single Supply, Precision Op Amps
Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
LT1178/LT1179 LT2178/LT2179
Dual/Quad 17µA Max, Single Supply, Precision Op Amps
Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW
LT1490/LT1491
Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps
Single Supply Input Range: – 0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT1636
Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp
55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function
LT1638/LT1639
Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps
0.4V/µs Slew Rate, 230µA Supply Current per Amplifier
LT1782
Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin 1637fd
16
Linear Technology Corporation
LT 0107 REV D • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
U
FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250µA Supply Current Max Operating Temperature Range: – 55°C to 125°C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/µs Low Input Offset Voltage: 350µV Max Single Supply Input Range: – 0.4V to 44V High Output Current: 25mA Min Specified on 3V, 5V and ±15V Supplies Output Shutdown Output Drives 4700pF with Output Compensation Reverse Battery Protection to 25V High Voltage Gain: 800V/mV High CMRR: 110dB Available in 8-Lead MSOP, PDIP and SO Packages; and a Tiny (3mm × 3mm × 0.8mm) DFN Package
U APPLICATIO S
■ ■ ■ ■
Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters
The LT1637 has a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode, even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 22V. There is no phase reversal of the output for inputs 5V below VEE or 44V above VEE, independent of VCC. The LT1637 op amp is available in the 8-pin MSOP, PDIP and SO packages. For space limited applications, the LT1637 is available in a 3mm × 3mm × 0.8mm dual fine pitch leadless package (DFN). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
U
■
The LT®1637 is a rugged op amp that operates on all single and split supplies with a total voltage of 2.7V to 44V. The LT1637 has a gain-bandwidth product of 1.1MHz while drawing less than 250µA of quiescent current. The LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3µA. The LT1637 is reverse supply protected: it draws virtually no current for reverse supply up to 25V. The input range of the LT1637 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1637 can drive heavy loads; its rail-to-rail output drives 25mA. The LT1637 is unity-gain stable into all capacitive loads up to 4700pF when optional 0.22µF and 150Ω compensation is used.
TYPICAL APPLICATIO
Over-The-Top® Current Source with Shutdown Current Source Timing
Switchable Precision Current Source
6V
4V TO 44V
+ 4.7µF
VSHDN
LT1004-1.2 2k
4V 2V
R
0V
R*
+ LT1637
TP0610
– IOUT SHDN
10mA
IOUT = 1.2 R e.g., 10mA = 120Ω
*OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R
IOUT 5mA
0mA
1637 TA01
100µs/DIV
1637 TA01b
1637fd
1
LT1637
U
W W
W
ABSOLUTE
AXI U RATI GS
(Note 1)
Total Supply Voltage (V + to V –) .............................. 44V Input Differential Voltage ......................................... 44V Input Current ...................................................... ±25mA Shutdown Pin Voltage Above V – ..................................... 32V Shutdown Pin Current ........................................ ±10mA Output Short-Circuit Duration (Note 2) ......... Continuous Operating Temperature Range (Note 3) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C LT1637MP ......................................... –55°C to 125°C
Specified Temperature Range (Note 4) LT1637C/LT1637I .............................. – 40°C to 85°C LT1637H .......................................... – 40°C to 125°C LT1637MP ......................................... –55°C to 125°C Junction Temperature ........................................... 150°C Junction Temperature (DD Package) ................... 125°C Storage Temperature Range ................. – 65°C to 150°C Storage Temperature Range (DD Package) ....................................... – 65°C to 125°C Lead Temperature (Soldering, 10 sec).................. 300°C
U W U PACKAGE/ORDER I FOR ATIO TOP VIEW
TOP VIEW
NULL 1
8
NULL
–IN A 2
7
V+
+IN A 3
6
OUT
V– 4
5
SHDN
DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/W (NOTE 2)
TOP VIEW NULL –IN +IN V–
1 2 3 4
8 7 6 5
NULL 1
8
NULL
–IN 2
7
V+
+IN 3
6
OUT
V– 4
5
SHDN
NULL V+ OUT SHDN
MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 250°C/W
N8 PACKAGE S8 PACKAGE 8-LEAD PDIP 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W (N8) TJMAX = 150°C, θJA = 190°C/W (S8)
UNDERSIDE METAL CONNECTED TO V –
ORDER PART NUMBER
DD PART* MARKING
ORDER PART NUMBER
MS8 PART* MARKING
LT1637CDD LT1637IDD
LAAK LAAK
LT1637CMS8 LT1637IMS8
LTIE LTIE
ORDER PART NUMBER
S8 PART MARKING 1637 1637I 1637H 1637MP
LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 LT1637HS8 LT1637MPS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
UNITS
100
350 550 700
µV µV µV
100
350 750 1100
µV µV µV
125
550 950 1100
µV µV µV 1637fd
2
LT1637
U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –,VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
IOS IB
PARAMETER Input Offset Voltage Drift (Note 9)
LT1637C/LT1637I MIN TYP MAX 1 3 2 6 2 6
CONDITIONS N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DDPackage, – 40°C ≤ TA ≤ 85°C
● ● ● ● ●
0.4
VCM = 44V (Note 5)
6.0 2.5
nA µA
● ●
20 23 0.1
50 60
nA µA nA
Input Offset Current Input Bias Current VCM = 44V (Note 5) VS = 0V
UNITS µV/°C µV/°C µV/°C
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential Common Mode, VCM = 0V to 44V
2.6 1.4
MΩ MΩ
CIN
Input Capacitance
4
pF
Input Voltage Range
1 0.7 ●
0
44
V
CMRR
Common Mode Rejection Ratio (Note 5)
VCM = 0V to (VCC – 1V) VCM = 0V to 44V (Note 8)
● ●
88 80
110 98
dB dB
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0°C ≤ TA ≤ 70°C VS = 3V, – 40°C ≤ TA ≤ 85°C
150 100 75
400
● ●
V/mV V/mV V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0°C ≤ TA ≤ 70°C VS = 5V, – 40°C ≤ TA ≤ 85°C
300 200 150
800
● ●
V/mV V/mV V/mV
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA
● ● ●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load VS = 3V, ISOURCE = 5mA
● ●
2.94 2.25
2.975 2.67
V V
VS = 5V, No Load VS = 5V, ISOURCE = 10mA
● ●
4.94 3.80
4.975 4.45
V V
VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC
10 15
14 45
mA mA
VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC
15 15
22 60
mA mA
90
98
dB
25
40
ISC
PSRR
Short-Circuit Current (Note 2)
Power Supply Rejection Ratio
VS = 3V to 12.5V, VCM = VO = 1V
●
Minimum Supply Voltage Reverse Supply Voltage IS
ISHDN
●
3 325 580
IS = – 100µA
Supply Current (Note 6)
●
8 700 1300
2.7
mV mV mV
V V
190
250 295
µA µA
●
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
3
12
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V
● ●
0.2 1.0 2.5 4.3
15 5
nA µA µA µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
0.02
1
µA 1637fd
3
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V –, VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
LT1637C/LT1637I MIN TYP MAX
PARAMETER
CONDITIONS
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
tON
Turn-On Time
VPIN5 = 5V to 0V, RL = 10k
45
µs
tOFF
Turn-Off Time
VPIN5 = 0V to 5V, RL = 10k
3
µs
tSETTLING
Settling Time
0.1% AV = 1, ∆VO = 2V
9
µs
GBW
Gain-Bandwidth Product (Note 5)
f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
650 550 500
1000
● ●
kHz kHz kHz
Slew Rate (Note 7)
AV = – 1, RL = ∞ 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
0.210 0.185 0.170
0.35
● ●
V/µs V/µs V/µs
SR
●
20
150
UNITS µA
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
N8, S8 Packages 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
MS8 Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
DD Package 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
● ●
N8, S8 Packages, – 40°C ≤ TA ≤ 85°C MS8 Package, – 40°C ≤ TA ≤ 85°C DD Package, – 40°C ≤ TA ≤ 85°C
Input Offset Voltage Drift (Note 9)
IOS
Input Offset Current
IB
Input Bias Current
UNITS
100
450 650 800
µV µV µV
100
450 800 1150
µV µV µV
125
650 1000 1150
µV µV µV
● ● ●
1 2 2
3 6 6
µV/°C µV/°C µV/°C
●
1
6
nA
17
50
●
nA
Input Noise Voltage
0.1Hz to 10Hz
0.6
µVP-P
en
Input Noise Voltage Density
f = 1kHz
27
nV/√Hz
in
Input Noise Current Density
f = 1kHz
0.08
pA/√Hz
RIN
Input Resistance
Differential Common Mode, VCM = – 15V to 14V
3 2200
MΩ MΩ
CIN
Input Capacitance
1
4
Input Voltage Range
●
– 15
pF 29
V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 29V
●
80
110
dB
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
100 75 50
400
● ●
V/mV V/mV V/mV
No Load ISINK = 5mA ISINK = 10mA
● ● ●
VOL
Output Voltage Swing LOW
– 14.997 – 14.680 – 14.420
– 14.95 – 14.25 – 13.65
V V V 1637fd
4
LT1637
±15V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V – unless otherwise specified. (Note 4) LT1637C/LT1637I MIN TYP MAX
SYMBOL
PARAMETER
CONDITIONS
VOH
Output Voltage Swing HIGH
No Load ISOURCE = 5mA ISOURCE = 10mA
● ● ●
14.9 14.2 13.7
14.967 14.667 14.440
V V V
ISC
Short-Circuit Current (Note 2)
Short Output to GND 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
±25 ±20 ±15
±31.7
● ●
mA mA mA
VS = ±1.5V to ±22V
●
90
115
dB
PSRR
Power Supply Rejection Ratio
IS
±1.35
V
230
300 370
µA µA
●
Minimum Supply Voltage Supply Current
●
ISHDN
UNITS
Positive Supply Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
6
40
µA
Shutdown Pin Current
VPIN5 = – 21.7V, VS = ±22V, No Load VPIN5 = – 20V, VS = ±22V, No Load
● ●
0.3 0.9
15 8
nA µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
20
150
µA
0.02
2
µA
Output Leakage Current, SHDN
VPIN5 = – 20V, VS = ±22V, No Load
●
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
tON
Turn-On Time
VPIN5 = – 10V to – 15V, RL = 10k
35
µs
tOFF
Turn-Off Time
VPIN5 = – 15V to – 10V, RL = 10k
3
µs
GBW
Gain-Bandwidth Product
f = 10kHz 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
750 650 600
1100
● ●
kHz kHz kHz
AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V 0°C ≤ TA ≤ 70°C – 40°C ≤ TA ≤ 85°C
0.225 0.200 0.180
0.4
● ●
V/µs V/µs V/µs
SR
Slew Rate
– 21.7
– 21.6 – 20.8
V –20.0
V
1637fd
5
LT1637 U 3V A D 5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4) SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP MIN TYP MAX
CONDITIONS
100 ●
IOS IB
UNITS
450 3
µV mV
Input Offset Voltage Drift (Note 9)
●
10
µV/°C
Input Offset Current VCM = 44V (Note 5)
● ●
15 10
nA µA
VCM = 44V (Note 5)
● ●
150 100
nA µA
44
V
Input Bias Current Input Voltage Range
CMRR
Common Mode Rejection Ratio (Note 5)
VCM = 0.3V to (VCC – 1V) VCM = 0.3V to 44V
AVOL
Large-Signal Voltage Gain
VS = 3V, VO = 500mV to 2.5V, RL = 10k
3
●
0.3
● ●
72 74 150 20
400
●
V/mV V/mV
300 35
800
●
V/mV V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
dB dB
VOL
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA
● ● ●
VOH
Output Voltage Swing HIGH
VS = 3V, No Load VS = 3V, ISOURCE = 5mA
● ●
2.90 2.05
V V
VS = 5V, No Load VS = 5V, ISOURCE = 10mA
● ●
4.90 3.50
V V
VS = 3V to 12.5V, VCM = VO = 1V
●
80
dB
●
2.7
V
●
23
V
PSRR
Power Supply Rejection Ratio Minimum Supply Voltage
IS
ISHDN
GBW SR
Reverse Supply Voltage
IS = – 100µA
Supply Current
(Note 6)
15 900 1500
mV mV mV
●
250 400
µA µA
190
Supply Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
15
µA
Shutdown Pin Current
VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5)
● ●
200 7
nA µA
Output Leakage Current, SHDN
VPIN5 = 2V, No Load (Note 6)
●
5
µA
Maximum Shutdown Pin Current
VPIN5 = 32V, No Load (Note 5)
●
200
µA
Gain-Bandwidth Product
f = 10kHz (Note 5)
Slew Rate
650 350
1000
●
kHz kHz
0.210 0.1
0.35
●
V/µs V/µs
AV = – 1, RL = ∞ (Note 7)
1637fd
6
LT1637
±15V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C for LT1637H and –55°C ≤ TA ≤ 125°C for LT1637MP. VS = ±15V, VCM = 0V, VOUT = 0V, VSHDN = V –, unless otherwise specified. (Note 4) SYMBOL
PARAMETER
VOS
Input Offset Voltage
LT1637H/LT1637MP MIN TYP MAX
CONDITIONS
100 ●
UNITS
550 3.4
µV mV
Input Offset Voltage Drift (Note 9)
●
11
µV/°C
IOS
Input Offset Current
●
25
nA
IB
Input Bias Current
●
250
nA
CMRR
Common Mode Rejection Ratio
VCM = –14.7V to 29V
AVOL
Large-Signal Voltage Gain
VO = ±14V, RL = 10k
3
●
72
●
100 4
Output Voltage Swing
No Load IOUT = ±5mA IOUT= ±10mA
● ● ●
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to 22V
●
84
●
±1.35
Minimum Supply Voltage Supply Current
V V V dB V
230 ●
ISHDN
V/mV V/mV ±14.8 ±14.0 ±13.4
VO
IS
dB 400
300 500
µA µA
Positive Supply Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
60
µA
Shutdown Pin Current
VPIN5 = –21.7V, VS = ±22V, No Load VPIN5 = –20V, VS = ±22V, No Load
● ●
200 10
nA µA
Maximum Shutdown Pin Current
VPIN5 = 32V, VS = ±22V
●
200
µA
Output Leakage Current, SHDN
VPIN5 = –20V, VS = ±22V, No Load
●
100
µA
VL
Shutdown Pin Input Low Voltage
VS = ±22V
●
–21.7
V
VH
Shutdown Pin Input High Voltage
VS = ±22V
●
–20
GBW
Gain-Bandwidth Product
f = 10kHz
750 400
1100
●
kHz kHz
0.225 0.1
0.4
●
V/µs V/µs
SR
Slew Rate
AV = – 1, RL = ∞, VO = ±10V, Measure at VO = ±5V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. The θJA specified for the DD package is with minimal PCB heat spreading metal. Using expanded metal area on all layers of a board reduces this value. Note 3: The LT1637C and LT1637I are guaranteed functional over the operating temperature range of – 40°C to 85°C. The LT1637H is guaranteed functional over the operating temperature range of –40°C to 125°C. The LT1637MP is guaranteed functional over the operating temperature range –55°C to 125°C. Note 4: The LT1637C is guaranteed to meet specified performance from 0°C to 70°C. The LT1637C is designed, characterized and expected to meet
V
specified performance from – 40°C to 85°C but is not tested or QA sampled at these temperatures. The LT1637I is guaranteed to meet specified performance from – 40°C to 85°C. The LT1637H is guaranteed to meet specified performance from –40°C to 125°C and the LT1637MP is guaranteed to meet specified performance from –55°C to 125°C. Note 5: VS = 5V limits are guaranteed by correlation to VS = 3V and VS = ±15V or VS = ±22V tests. Note 6: VS = 3V limits are guaranteed by correlation to VS = 5V and VS = ±15V or VS = ±22V tests. Note 7: Guaranteed by correlation to slew rate at VS = ±15V and GBW at VS = 3V and VS = ±15V tests. Note 8: This specification implies a typical input offset voltage of 650µV at VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V. Note 9: This parameter is not 100% tested.
1637fd
7
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage
300 TA = 125°C
200
TA = 25°C
150
TA = –55°C
100 50 0
40
300
30
200 100 0
TA = 125°C
–100 TA = –55°C
–200 –300
10 20 30 40 TOTAL SUPPLY VOLTAGE (V)
0.08
0.04
1 2 3 4 TOTAL SUPPLY VOLTAGE (V)
5
4
1
Output Saturation Voltage vs Input Overdrive
10 OUTPUT SATURATION VOLTAGE (V)
TA = 25°C TA = – 55°C
0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA)
100
100
VS = 5V, 0V VOD = 30mV 1
0.1 TA = 125°C TA = 25°C
0.01
TA = – 55°C
0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA)
1637 G04
3
4 5 6 TIME (s)
7
8
50 40 30
9
10
1637 G07
OUTPUT HIGH
20 10
OUTPUT LOW 0
10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
Input Noise Current vs Frequency 1.4 INPUT NOISE CURRENT DENSITY (pA/√Hz)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
NOISE VOLTAGE (200nV/DIV)
2
60
Noise Voltage Density vs Frequency VS = ±15V 60
50
40
30
20
1
70
1637 G06
70
0
80
0
100
VS = 5V, 0V NO LOAD
90
1637 G05
0.1Hz to 10Hz Noise Voltage VS = ± 2.5V
4.2 4.4 4.6 4.8 5 10 20 30 40 50 COMMON MODE VOLTAGE (V) 1637 G03
Output Saturation Voltage vs Load Current (Output Low)
TA = 125°C
TA = 25°C
0
1637 G02
Output Saturation Voltage vs Load Current (Output High)
0.1
TA = 125°C
0.04
0.08
0
VS = 5V, 0V VOD = 30mV
TA = –55°C
0.12
TA = 25°C
1637 G01
OUTPUT SATURATION VOLTAGE (V)
10
–400 0
VS = 5V, 0V
20
OUTPUT SATURATION VOLTAGE (mV)
SUPPLY CURRENT (µA)
350
400
INPUT BIAS CURRENT (µA)
CHANGE IN INPUT OFFSET VOLTAGE (µV)
400
250
Input Bias Current vs Common Mode Voltage
Minimum Supply Voltage
1
10 100 FREQUENCY (Hz)
1000 1637 G08
VS = ±15V
1.2 1.0 0.8 0.6 0.4 0.2 0 1
10 100 FREQUENCY (Hz)
1000 1637 G09
1637fd
8
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Open-Loop Gain and Phase Shift vs Frequency
Gain-Bandwidth Product vs Temperature
VS = ±2.5V
80
PHASE
40
60
30
40 GAIN
20
20
10
0
0
PHASE SHIFT (DEG)
GAIN (dB)
50
100
–10 –20
1300
0.7
1200
0.6
1000
–30 1k
10k 100k FREQUENCY (Hz)
VS = ±15V
1100
VS = ±1.5V
900
700 – 50 –25
1M
50 25 75 0 TEMPERATURE (°C)
100
1637 G10
50 PHASE MARGIN 45 40 GAIN BANDWIDTH
1100
35
1050
30
5
10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V)
45
COMMON MODE REJECTION RATIO (dB)
1250
0
25
80 VS = ±15V
70 60
VS = ±1.5V
50 40 30 20 10
50 75 25 TEMPERATURE (°C)
100
70 60 POSITIVE SUPPLY
50 40 30
NEGATIVE SUPPLY
20 10 0
10k 100k FREQUENCY (Hz)
1M
1k
10k 100k FREQUENCY (Hz)
1M 1637 G15
Undistorted Output Swing vs Frequency
Output Impedance vs Frequency 10k
35 VS = ± 2.5V
30
PHASE MARGIN
125
VS = ± 2.5V
80
1637 G14
45
Vs = ±15V
DISTORTION ≤ 1% AV = 1
1100
35
1000
30 GAIN BANDWIDTH
900
25
800
20
700
100
AV = 100
10
AV = 10
1
AV = 1
OUTPUT SWING (VP-P)
40
OUTPUT IMPEDANCE (Ω)
1k
1200
10 100k 1637 G16
0.1 100
1k
25 20 15 10 5
15 10k LOAD RESISTANCE (Ω)
0
–10 1k
50 VS = ± 2.5V
– 25
1637 G12
0
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
1400
1k
FALLING, VS = ±1.5V
PSRR vs Frequency
90
Gain-Bandwidth Product and Phase Margin vs Load Resistance
600
0.3
90
1637 G13
1300
FALLING, VS = ±15V
0.1 – 50
125
100
PHASE MARGIN (DEG)
GAIN-BANDWIDTH PRODUCT (kHz)
55
1150
RISING, VS = ±1.5V
0.4
CMRR vs Frequency
1300
1000
0.5
1637 G11
Gain-Bandwidth Product and Phase Margin vs Supply Voltage
1200
RISING, VS = ±15V
0.2
800
POWER SUPPLY REJECTION RATIO (dB)
60
Slew Rate vs Temperature
SLEW RATE (V/µs)
120 GAIN-BANDWIDTH PRODUCT (kHz)
70
10k 100k FREQUENCY (Hz)
1M 1637 G17
0 100
Vs = ± 2.5V
1k 10k FREQUENCY (Hz)
100k 1637 G18
1637fd
9
LT1637 U W
TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling, Overshoot vs Capacitive Load
Settling Time to 0.1% vs Output Step 100
VS = ±15V
8
90 80
AV = – 1
AV = 1
OVERSHOOT (%)
OUTPUT STEP (V)
6 4 2 0 –2 –4 AV = 1
–6
10 VS = ±2.5V NO OUTPUT COMPENSATION
AV = – 1
AV = 1
60
AV = 5
50 AV = 10
40 30 20
–8
VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k
1
AV = 2
70
THD + NOISE (%)
10
Total Harmonic Distortion + Noise vs Frequency
0.1
0.01 AV = –1
0.001
AV = 1
10
–10 0
10
0
30 20 SETTLING TIME (µs)
40
0.0001 10
100 1000 CAPACITIVE LOAD (pF)
10000
Total Harmonic Distortion + Noise vs Load Resistance 10
VS = 3V, 0V VIN = 0.6V TO 2.4V
0.01
1637 G21
RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = –1, RG = 100k
1 THD + NOISE (%)
THD + NOISE (%)
0.1
100k
Total Harmonic Distortion + Noise vs Output Voltage
VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz
VS = ±1.5V VIN = ±0.9V
1k 10k FREQUENCY (Hz)
1637 G20
1637 G19
1
100
10
0.001
AV = 1 VS = 3V, 0V
AV = –1 VS = ±1.5V AV = 1 VS = ±1.5V
0.1
AV = 1 VS = 3V, 0V
0.01 VS = 3V, 0V VIN = 0.3V TO 2.1V
AV = –1, VS = 3V, 0V
0.001
0.0001 100
1k 10k LOAD RESISTANCE TO GROUND (Ω)
0
100k
1 2 OUTPUT VOLTAGE (VP-P)
1637 G23
1637 G22
CHANGE IN INPUT OFFSET VOLTAGE (50µV/DIV)
Open-Loop Gain
Large-Signal Response
Small-Signal Response
VS = ±15V AV = – 1
VS = ±15V
VS = ±15V AV = 1
10V
A A
B C
3
50mV B C – 50mV
A: RL = 2k B: RL = 10k C: RL = 50k –10V 0V 10V OUTPUT VOLTAGE (5V/DIV)
– 10V
1637 G24
1637 G25
1637 G26
1637fd
10
LT1637
U
W
U
U
APPLICATIO S I FOR ATIO Supply Voltage
The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01µF) within an inch of the pin. When driving heavy loads an additional 4.7µF electrolytic capacitor should be used. When using split supplies, the same is true for the negative supply pin. The LT1637 is protected against reverse battery voltages up to 25V. In the event a reverse battery condition occurs, the supply current is typically less than 1nA. When operating the LT1637 on total supplies of 30V or more, the supply must not be brought up faster than 1µs. This is especially true if low ESR bypass capacitors are used. A series RLC circuit is formed from the supply lead inductance and the bypass capacitor. 5Ω of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. Inputs The LT1637 has two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve. For input voltages about 0.9V or more below V +, the PNP input stage is active and the input bias current is typically – 20nA. When the input voltage is about 0.5V or less from V +, the NPN input stage is operating and the input bias current is typically 80nA. Increases in temperature will cause the voltage at which operation switches from the PNP stage to the NPN stage to move towards V +. The input offset voltage of the NPN stage is untrimmed and is typically 600µV. A Schottky diode in the collector of each NPN transistor of the NPN input stage allows the LT1637 to operate with either or both of its inputs above V +. At about 0.3V above V + the NPN input transistor is fully saturated and the input bias current is typically 23µA at room temperature. The input offset voltage is typically 600µV when operating above V +. The LT1637 will operate with its input 44V above V – regardless of V +.
The inputs are protected against excursions as much as 22V below V – by an internal 1.3k resistor in series with each input and a diode from the input to the negative supply. There is no output phase reversal for inputs up to 5V below V –. There are no clamping diodes between the inputs and the maximum differential input voltage is 44V. Output The output voltage swing of the LT1637 is affected by input overdrive as shown in the typical performance curves. When monitoring input voltages within 100mV of V +, gain should be taken to keep the output from clipping. The output of the LT1637 can be pulled up to 25V beyond V + with less than 1nA of leakage current, provided that V + is less than 0.5V. The normally reverse biased substrate diode from the output to V – will cause unlimited currents to flow when the output is forced below V –. If the current is transient and limited to 100mA, no damage will occur. The LT1637 is internally compensated to drive at least 200pF of capacitance under any output loading conditions. A 0.22µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 4700pF, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1637 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1637 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V + – 0.9V). See the Typical Performance Characteristics curves.
1637fd
11
LT1637 U
U
W
U
APPLICATIO S I FOR ATIO
The shutdown pin can be taken up to 32V above V –. The shutdown pin can be driven below V –, however the pin current through the substrate diode should be limited with an external resistor to less than 10mA.
Gain The open-loop gain is less sensitive to load resistance when the output is sourcing current. This optimizes performance in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details.
Input Offset Nulling The input offset voltage can be nulled by placing a 10k potentiometer between Pins 1 and 8 with its wiper to V – (see Figure 1). The null range will be at least ±3mV.
Shutdown The LT1637 can be shut down two ways: using the shutdown pin or bringing V + to within 0.5V of V –. When V + is brought to within 0.5V of V – both the supply current and output leakage current drop to less than 10nA. When the shutdown pin is brought 1.2V above V –, the supply current drops to about 3µA and the output leakage current is less than 1µA, independent of V +. In either case the input bias current is less than 0.1nA (even if the inputs are 44V above the negative supply).
LT1637 8 1 10k
V–
1637 F01
Figure 1. Input Offset Nulling
W W SI PLIFIED SCHE ATIC 7 V+ Q1
Q13 D1
– IN
SHDN 10µA
Q25 Q23
R3 1.3k
R2 6k 5
Q19
D2
2
Q2
R1 1M
D3 Q21
R4 1.3k + IN
Q9
Q10
Q14 Q15
Q18
Q20
Q24 6 OUT
Q22
3 Q11
Q12
Q17
Q16
Q26
Q3 Q4 Q5
Q6 Q7
Q8
D4
D5
NULL
R5 7k
R6 7k
R7 400Ω
R8 400Ω
1
8 NULL
4 V– 1637 SS
1637fd
12
LT1637
U
TYPICAL APPLICATIO S Optional Output Compensation for Capacitive Loads Greater Than 200pF
Positive Supply Rail Current Sense 5V
+
VIN
200Ω
LT1637 CL ≤ 4700pF
– 0.2Ω
+
LOAD
Q1 2N3904
LT1637
200Ω
–
0.22µF
0V TO 4.3V
150Ω
2k
ILOAD
1637 TA03 1637 TA02
VOUT = (2Ω)(ILOAD)
Lamp Outage Detector 3V
5V TO 44V 1M LAMP ON/OFF
100k 5k 0.5Ω
– LT1637
OUT
+
OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB 1637 TA05
Over-The-Top Comparator with Hysteresis
Over-The-Top Current Sense 3V TO 44V R1 200Ω
1M 3V TO 44V IN1 (0V TO 44V)
10k
3V
+ VOUT
LT1637
–
RS 0.2Ω
+ LT1637
1M
– 1M
2N5087 IN2 (0V TO 44V)
10k
ILOAD
1M
LOAD V HYSTERESIS = CC 100
2N5210
ILOAD =
VOUT (RS)(R2/R1)
Q1 2N3904 VOUT (0V TO 2.7V) R2 2k 1637 TA06
1637 TA04
1637fd
13
LT1637
U
PACKAGE DESCRIPTIO
DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) R = 0.115 TYP 5
0.38 ± 0.10 8
0.675 ±0.05
1.65 ± 0.10 (2 SIDES)
3.00 ±0.10 (4 SIDES)
3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES)
PIN 1 TOP MARK (NOTE 6)
PACKAGE OUTLINE
(DD) DFN 1203
0.75 ±0.05
0.200 REF
0.25 ± 0.05
4 0.25 ± 0.05
0.50 BSC 2.38 ±0.05 (2 SIDES)
1 0.50 BSC
2.38 ±0.10 (2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005)
5.23 (.206) MIN
3.20 – 3.45 (.126 – .136)
0.42 ± 0.038 (.0165 ± .0015) TYP
3.00 ± 0.102 (.118 ± .004) (NOTE 3)
0.65 (.0256) BSC
8
7 6 5
0.52 (.0205) REF
RECOMMENDED SOLDER PAD LAYOUT
0.254 (.010)
3.00 ± 0.102 (.118 ± .004) (NOTE 4)
4.90 ± 0.152 (.193 ± .006)
DETAIL “A” 0° – 6° TYP
GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A”
1
2 3
4
1.10 (.043) MAX
0.86 (.034) REF
0.18 (.007) SEATING PLANE
0.22 – 0.38 (.009 – .015) TYP
0.65 (.0256) BSC
0.127 ± 0.076 (.005 ± .003) MSOP (MS8) 0204
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
1637fd
14
LT1637
U
PACKAGE DESCRIPTIO
N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8
7
6
5
1
2
3
4
.255 ± .015* (6.477 ± 0.381)
.300 – .325 (7.620 – 8.255)
.065 (1.651) TYP
.008 – .015 (0.203 – 0.381)
(
+.035 .325 –.015 8.255
+0.889 –0.381
.130 ± .005 (3.302 ± 0.127)
.045 – .065 (1.143 – 1.651)
)
.120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076)
.100 (2.54) BSC
N8 1002
NOTE: 1. DIMENSIONS ARE
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3
.045 ±.005 .050 BSC 8
.245 MIN
7
6
5
.160 ±.005
.150 – .157 (3.810 – 3.988) NOTE 3
.228 – .244 (5.791 – 6.197)
.030 ±.005 TYP
1
RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254)
0°– 8° TYP
.016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN
.053 – .069 (1.346 – 1.752)
.014 – .019 (0.355 – 0.483) TYP
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2
3
4
.004 – .010 (0.101 – 0.254)
.050 (1.270) BSC
SO8 0303
1637fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1637
U
TYPICAL APPLICATIO S Sample-and-Hold 3V VIN
3V
+ +
LT1637
–
0.22µF
SHDN VSAMPLE
LT1636
150Ω
VOUT
–
3V
1637 TA07
0V DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
MUX Amplifier
MUX Amplifier Waveforms
5V VIN1 5kHz AT 4VP-P
+ VOUT
LT1637
–
VOUT 2V/DIV
SHDN
5V
–
INPUT SELECT 5V/DIV
LT1637 VIN2 10kHz AT 2VP–P
+
0.2ms/DIV
SHDN
1637 TA08
INPUT SELECT 1kHz AT 5VP–P 74HC04
1637 TA09
RELATED PARTS PART NUMBER
DESCRIPTION
COMMENTS
LT1078/LT1079 LT2078/LT2079
Dual/Quad 55µA Max, Single Supply, Precision Op Amps
Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 2.5µV/°C Drift (Max), 200kHz GBW, 0.07V/µs Slew Rate
LT1178/LT1179 LT2178/LT2179
Dual/Quad 17µA Max, Single Supply, Precision Op Amps
Input/Output Common Mode Includes Ground, 70µV VOS(MAX) and 4µV/°C Drift (Max), 85kHz GBW, 0.04V/µs Slew Rate
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW
LT1490/LT1491
Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps
Single Supply Input Range: – 0.4V to 44V, Micropower 50µA per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW
LT1636
Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp
55µA Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function
LT1638/LT1639
Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps
0.4V/µs Slew Rate, 230µA Supply Current per Amplifier
LT1782
Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 55µA (Max), Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 300µA (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin 1637fd
16
Linear Technology Corporation
LT 0107 REV D • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
