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FEATURES
s s s s s s s s s s s s s s s s
LT1637 1.1MHz, 0.4V/s Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp DESCRIPTIO
The LT(R)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 250A of quiescent current. The LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3A. 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 0.22F and 150 compensation is used. 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 x 3mm x 0.8mm dual fine pitch leadless package (DFN).
, LTC and LT are registered trademarks of Linear Technology Corporation. Over-The-Top is a registered trademark of Linear Technology Corporation.
Operates with Inputs Above V + Rail-to-Rail Input and Output Micropower: 250A Supply Current Max Tiny 3mm x 3mm x 0.8mm DFN Package Operating Temperature Range: - 40C to 125C Gain-Bandwidth Product: 1.1MHz Slew Rate: 0.4V/s Low Input Offset Voltage: 350V 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
APPLICATIO S
s
s s s s
Battery or Solar Powered Systems: Portable Instrumentation Sensor Conditioning Supply Current Sensing Battery Monitoring MUX Amplifiers 4mA to 25mA Transmitters
TYPICAL APPLICATIO
+
4.7F R* LT1004-1.2 2k
Over-The-Top(R) Current Source with Shutdown Switchable Precision Current Source
4V TO 44V
Current Source Timing
6V VSHDN 4V 2V 0V
R
+
LT1637 TP0610 IOUT = 1.2 R e.g., 10mA = 120
1637 TA01
10mA IOUT 5mA 0mA 100s/DIV
1637 TA01b
-
IOUT SHDN
*OPTIONAL FOR LOW OUTPUT CURRENTS, R* = R
U
U
U
1637FB
1
LT1637
ABSOLUTE
(Note 1)
AXI U RATI GS
Specified Temperature Range (Note 4) LT1637C/LT1637I .............................. - 40C to 85C LT1637H .......................................... - 40C to 125C Junction Temperature ........................................... 150C Junction Temperature (DD Package) ................... 125C Storage Temperature Range ................. - 65C to 150C Storage Temperature Range (DD Package) ....................................... - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
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 .............................. - 40C to 85C LT1637H .......................................... - 40C to 125C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL 1 -IN A 2 +IN A 3 V- 4 8 7 6 5 NULL V
+
OUT SHDN
NULL -IN +IN V-
1 2 3 4
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 250C/W
TJMAX = 125C, JA = 160C/W (NOTE 2) UNDERSIDE METAL CONNECTED TO V -
ORDER PART NUMBER LT1637CDD LT1637IDD
DD PART* MARKING LAAK
ORDER PART NUMBER LT1637CMS8
*The temperature grades are identified by a label on the shipping container. Consult factory for parts specified with wider operating temperature ranges.
3V A D 5V ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS N8, S8 Packages 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C DD Package 0C TA 70C - 40C TA 85C
The q denotes the specifications which apply over the full operating temperature range of -40C TA 85C, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V -,VCM = VOUT = half supply unless otherwise specified. (Note 4)
LT1637C/LT1637I MIN TYP MAX 100
q q
2
U
U
W
WW U
W
TOP VIEW
TOP VIEW 8 7 6 5 NULL V+ OUT SHDN
NULL 1 -IN 2 +IN 3 V- 4 N8 PACKAGE 8-LEAD PDIP
8 7 6 5
NULL V+ OUT SHDN
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/W (N8) TJMAX = 150C, JA = 190C/W (S8)
MS8 PART MARKING LTIE
ORDER PART NUMBER LT1637CN8 LT1637CS8 LT1637IN8 LT1637IS8 LT1637HS8
S8 PART MARKING 1637 1637I 1637H
U
UNITS V V V V V V V V V
1637FB
350 550 700 350 750 900 550 950 1100
100
q q
125
q q
LT1637
3V A D 5V ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Offset Voltage Drift (Note 9)
The q denotes the specifications which apply over the full operating temperature range of -40C TA 85C, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V -,VCM = VOUT = half supply unless otherwise specified. (Note 4)
CONDITIONS N8, S8 Packages, - 40C TA 85C MS8 Package, - 40C TA 85C DDPackage, - 40C TA 85C VCM = 44V (Note 5) IB Input Bias Current VCM = 44V (Note 5) VS = 0V Input Noise Voltage en in RIN CIN CMRR AVOL Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio (Note 5) Large-Signal Voltage Gain VCM = 0V to (VCC - 1V) VCM = 0V to 44V (Note 8) VS = 3V, VO = 500mV to 2.5V, RL = 10k VS = 3V, 0C TA 70C VS = 3V, - 40C TA 85C VS = 5V, VO = 500mV to 4.5V, RL = 10k VS = 5V, 0C TA 70C VS = 5V, - 40C TA 85C VOL Output Voltage Swing LOW No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA ISC Short-Circuit Current (Note 2) VS = 3V, Short Output to Ground VS = 3V, Short Output to VCC VS = 5V, Short Output to Ground VS = 5V, Short Output to VCC PSRR Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage IS Supply Current (Note 6) Supply Current, SHDN ISHDN Shutdown Pin Current VPIN5 = 2V, No Load (Note 6) VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 3.3V VPIN5 = 5V VPIN5 = 2V, No Load (Note 6) IS = - 100A VS = 3V to 12.5V, VCM = VO = 1V
q q q q q q q q q q q q q q q q q q q q q
IOS
VOH
U
q q q q q q q
LT1637C/LT1637I MIN TYP MAX 1 3 2 6 2 6 0.4 20 23 0.1 0.6 27 0.08 1 0.7 0 88 80 150 100 75 300 200 150 110 98 400 2.6 1.4 4 44 6.0 2.5 50 60
UNITS V/C V/C V/C nA A nA A nA VP-P nV/Hz pA/Hz M M pF V dB dB V/mV V/mV V/mV V/mV V/mV V/mV
Input Offset Current
0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = 0V to 44V
800
3 325 580 2.94 2.25 4.94 3.80 10 15 15 15 90 25 2.975 2.67 4.975 4.45 14 45 22 60 98
8 700 1300
mV mV mV V V V V mA mA mA mA dB
Output Voltage Swing HIGH
2.7 40 190 3 0.2 1.0 2.5 4.3 0.02 250 295 12 15 5
V V A A A nA A A A A
1637FB
Output Leakage Current, SHDN
q
1
3
LT1637
The q denotes the specifications which apply over the full operating temperature range of -40C TA 85C, otherwise specifications are at TA = 25C. VS = 3V, 0V; VS = 5V, 0V; VSHDN = V -, VCM = VOUT = half supply unless otherwise specified. (Note 4)
SYMBOL tON tOFF tSETTLING GBW PARAMETER Maximum Shutdown Pin Current Turn-On Time Turn-Off Time Settling Time Gain-Bandwidth Product (Note 5) Slew Rate (Note 7) CONDITIONS VPIN5 = 32V, No Load (Note 5) VPIN5 = 5V to 0V, RL = 10k VPIN5 = 0V to 5V, RL = 10k 0.1% AV = 1, VO = 2V f = 10kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = 0C TA 70C - 40C TA 85C
q q q q q
3V A D 5V ELECTRICAL CHARACTERISTICS
SR
The q denotes the specifications which apply over the full operating temperature range of -40C TA 85C, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS N8, S8 Packages 0C TA 70C - 40C TA 85C MS8 Package 0C TA 70C - 40C TA 85C DD Package 0C TA 70C - 40C TA 85C Input Offset Voltage Drift (Note 9) N8, S8 Packages, - 40C TA 85C MS8 Package, - 40C TA 85C DD Package, - 40C TA 85C
q q
15V ELECTRICAL CHARACTERISTICS
IOS IB en in RIN CIN CMRR AVOL
VOL
4
U
LT1637C/LT1637I MIN TYP MAX 20 45 3 9 650 550 500 0.210 0.185 0.170 1000 150
UNITS A s s s kHz kHz kHz V/s V/s V/s
0.35
LT1637C/LT1637I MIN TYP MAX 100 450 650 800 450 800 950 650 1000 1150 3 6 6 6 50
UNITS V V V V V V V V V V/C V/C V/C nA nA VP-P nV/Hz pA/Hz M M pF
100
q q
125
q q q q q q q
1 2 2 1 17 0.6 27 0.08 1 3 2200 4
Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Input Capacitance Input Voltage Range Common Mode Rejection Ratio Large-Signal Voltage Gain VCM = - 15V to 29V VO = 14V, RL = 10k 0C TA 70C - 40C TA 85C No Load ISINK = 5mA ISINK = 10mA 0.1Hz to 10Hz f = 1kHz f = 1kHz Differential Common Mode, VCM = - 15V to 14V
q q q q q q q
- 15 80 100 75 50 110 400
29
V dB V/mV V/mV V/mV
Output Voltage Swing LOW
- 14.997 - 14.680 - 14.420
- 14.95 - 14.25 - 13.65
V V V
1637FB
LT1637
The q denotes the specifications which apply over the full operating temperature range of -40C TA 85C, otherwise specifications are at TA = 25C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - unless otherwise specified. (Note 4)
SYMBOL VOH PARAMETER Output Voltage Swing HIGH CONDITIONS No Load ISOURCE = 5mA ISOURCE = 10mA Short Output to GND 0C TA 70C - 40C TA 85C VS = 1.5V to 22V
q q q q q q q
15V ELECTRICAL CHARACTERISTICS
LT1637C/LT1637I MIN TYP MAX 14.9 14.2 13.7 25 20 15 90 14.967 14.667 14.440 31.7
UNITS V V V mA mA mA dB
ISC
Short-Circuit Current (Note 2)
PSRR IS
Power Supply Rejection Ratio Minimum Supply Voltage Supply Current
115 1.35 230 300 370 40 15 8 150 2 -20.0
V A A A nA A A A V V s s kHz kHz kHz V/s V/s V/s
q
Positive Supply Current, SHDN ISHDN Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current, SHDN VL VH tON tOFF GBW Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Turn-On Time Turn-Off Time Gain-Bandwidth Product
VPIN5 = - 20V, VS = 22V, No Load VPIN5 = - 21.7V, VS = 22V, No Load VPIN5 = - 20V, VS = 22V, No Load VPIN5 = 32V, VS = 22V VPIN5 = - 20V, VS = 22V, No Load VS = 22V VS = 22V VPIN5 = - 10V to - 15V, RL = 10k VPIN5 = - 15V to - 10V, RL = 10k f = 10kHz 0C TA 70C - 40C TA 85C AV = - 1, RL = , VO = 10V, Measure at VO = 5V 0C TA 70C - 40C TA 85C
q q q q q q q
6 0.3 0.9 20 0.02 - 21.7 - 21.6 - 20.8 35 3 750 650 600 0.225 0.200 0.180 1100
q q q q
SR
Slew Rate
0.4
1637FB
5
LT1637
The q denotes the specifications which apply over the full operating temperature range of -40C TA 125C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage
q
3V A D 5V ELECTRICAL CHARACTERISTICS
CONDITIONS
IOS IB
CMRR AVOL
VOL
VOH
PSRR
IS
ISHDN
GBW SR
6
U
MIN
LT1637H TYP 100
MAX 450 3 10 15 10 150 100
UNITS V mV V/C nA A nA A V dB dB
Input Offset Voltage Drift (Note 9) Input Offset Current VCM = 44V (Note 5) Input Bias Current VCM = 44V (Note 5) Input Voltage Range Common Mode Rejection Ratio (Note 5) Large-Signal Voltage Gain VCM = 0.3V to (VCC - 1V) VCM = 0.3V to 44V VS = 3V, VO = 500mV to 2.5V, RL = 10k
q q q q q q q q q
3
0.3 72 74 150 20 300 35 400 800
44
V/mV V/mV V/mV V/mV 15 900 1500 mV mV mV V V V V dB V V
VS = 5V, VO = 500mV to 4.5V, RL = 10k
q
Output Voltage Swing LOW
No Load ISINK = 5mA VS = 5V, ISINK = 10mA VS = 3V, No Load VS = 3V, ISOURCE = 5mA VS = 5V, No Load VS = 5V, ISOURCE = 10mA
q q q q q q q q q
Output Voltage Swing HIGH
2.90 2.05 4.90 3.50 80 2.7 23 190 250 400 15 200 7 5 200 650 350 0.210 0.1 1000 0.35
Power Supply Rejection Ratio Minimum Supply Voltage Reverse Supply Voltage Supply Current Supply Current, SHDN Shutdown Pin Current Output Leakage Current, SHDN Maximum Shutdown Pin Current Gain-Bandwidth Product Slew Rate
VS = 3V to 12.5V, VCM = VO = 1V IS = - 100A (Note 6)
q q
A A A nA A A A kHz kHz V/s V/s
VPIN5 = 2V, No Load (Note 6) VPIN5 = 0.3V, No Load (Note 6) VPIN5 = 2V, No Load (Note 5) VPIN5 = 2V, No Load (Note 6) VPIN5 = 32V, No Load (Note 5) f = 10kHz (Note 5)
q q q q q q
AV = - 1, RL = (Note 7)
q
1637FB
LT1637
15V ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range of -40C TA 125C. VS = 15V, VCM = 0V, VOUT = 0V, VSHDN = V - , TA = -40C to 125C, unless otherwise specified. (Note 4)
SYMBOL VOS PARAMETER Input Offset Voltage
q
CONDITIONS
MIN
LT1637H TYP 100
MAX 550 3.4 11 25 250
UNITS V mV V/C nA nA dB V/mV V/mV
Input Offset Voltage Drift (Note 9) IOS IB CMRR AVOL VO Input Offset Current Input Bias Current Common Mode Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing VCM = -14.7V to 29V VO = 14V, RL = 10k
q q q q q
3
72 100 4 400 14.8 14.0 13.4 84 1.35 230 300 500 60 200 10 200 100 -21.7 -20 750 400 0.225 0.1 1100 0.4
No Load IOUT = 5mA IOUT= 10mA VS = 1.5V to 22V
q q q q q q
V V V dB V A A A nA A A A V V kHz kHz V/s V/s
PSRR IS
Power Supply Rejection Ratio Minimum Supply Voltage Supply Current Positive Supply Current, SHDN
VPIN5 = -20V, VS = 22V, No Load VPIN5 = -21.7V, VS = 22V, No Load VPIN5 = -20V, VS = 22V, No Load VPIN5 = 32V, VS = 22V VPIN5 = -20V, VS = 22V, No Load VS = 22V VS = 22V f = 10kHz
q q q q q q q q
ISHDN
Shutdown Pin Current Maximum Shutdown Pin Current Output Leakage Current, SHDN
VL VH GBW SR
Shutdown Pin Input Low Voltage Shutdown Pin Input High Voltage Gain-Bandwidth Product Slew Rate
AV = - 1, RL = , VO = 10V, Measure at VO = 5V
q
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum. The JA 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 - 40C to 85C. The LT1637H is guaranteed functional over the operating temperature range of -40C to 125C. Note 4: The LT1637C is guaranteed to meet specified performance from 0C to 70C. The LT1637C is designed, characterized and expected to meet specified performance from - 40C to 85C but is not tested or QA sampled
at these temperatures. The LT1637I is guaranteed to meet specified performance from - 40C to 85C. The LT1637H is guaranteed to meet specified performance from -40C to 125C. 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 650V at VCM = 44V and a maximum input offset voltage of 5.4mV at VCM = 44V. Note 9: This parameter is not 100% tested.
1637FB
7
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
400 400
CHANGE IN INPUT OFFSET VOLTAGE (V)
350
SUPPLY CURRENT (A)
300 250 200 150 100 50 0 0 10 20 30 40 TOTAL SUPPLY VOLTAGE (V)
1637 G01
200 100 0 -100 -200 -300 -400 0 1 2 3 4 TOTAL SUPPLY VOLTAGE (V) 5
1637 G02
INPUT BIAS CURRENT (A)
TA = 125C TA = 25C TA = -55C
Output Saturation Voltage vs Load Current (Output High)
1
OUTPUT SATURATION VOLTAGE (V) OUTPUT SATURATION VOLTAGE (V)
OUTPUT SATURATION VOLTAGE (mV)
VS = 5V, 0V VOD = 30mV
0.1
TA = 125C TA = 25C TA = - 55C
0.01 0.1 1 10 0.0001 0.001 0.01 SOURCING LOAD CURRENT (mA)
0.1Hz to 10Hz Noise Voltage
70 INPUT NOISE VOLTAGE DENSITY (nV/Hz)
VS = 2.5V
NOISE VOLTAGE (200nV/DIV)
VS = 15V 60
INPUT NOISE CURRENT DENSITY (pA/Hz)
0
1
2
3
456 TIME (s)
7
8
UW
1637 G04
Minimum Supply Voltage
40 30 20 10 0.12 0.08 0.04 0 0.04 0.08
Input Bias Current vs Common Mode Voltage
VS = 5V, 0V
300
TA = -55C
TA = 125C TA = -55C TA = 25C
TA = 125C TA = 25C
4
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)
10 VS = 5V, 0V VOD = 30mV 1
100 90 80 70 60 50 40 30 20 10 0
Output Saturation Voltage vs Input Overdrive
VS = 5V, 0V NO LOAD
0.1 TA = 125C 0.01 TA = 25C TA = - 55C 100
1637 G05
OUTPUT HIGH
100
0.001 0.1 1 10 0.0001 0.001 0.01 SINKING LOAD CURRENT (mA)
OUTPUT LOW 0 10 20 30 40 50 60 70 80 90 100 INPUT OVERDRIVE (mV)
1637 G06
Noise Voltage Density vs Frequency
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0
Input Noise Current vs Frequency
VS = 15V
50
40
30
20
8
9
10
1
10 100 FREQUENCY (Hz)
1000
1637 G08
1
10 100 FREQUENCY (Hz)
1000
1637 G09
1637 G07
1637FB
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Open-Loop Gain and Phase Shift vs Frequency
70 60 50 40
GAIN (dB)
VS = 2.5V PHASE
GAIN-BANDWIDTH PRODUCT (kHz)
1100 1000 900 800 700 - 50 -25
SLEW RATE (V/s)
30 20 10 0 -10 -20 -30 1k 10k 100k FREQUENCY (Hz) 1M
1637 G10
GAIN
Gain-Bandwidth Product and Phase Margin vs Supply Voltage
1300 55 COMMON MODE REJECTION RATIO (dB) 50 PHASE MARGIN 1200 1150 GAIN BANDWIDTH 1100 1050 1000 35 30 25 45 40
100 90 80 70 60 50 40 30 20 10 0
POWER SUPPLY REJECTION RATIO (dB)
GAIN-BANDWIDTH PRODUCT (kHz)
1250
0
5
10 15 20 25 30 35 40 TOTAL SUPPLY VOLTAGE (V)
Gain-Bandwidth Product and Phase Margin vs Load Resistance
1400
GAIN-BANDWIDTH PRODUCT (kHz)
1300 1200 1100 1000
VS = 2.5V PHASE MARGIN
OUTPUT SWING (VP-P)
40 35 30 GAIN BANDWIDTH 25 20 15 1k 10k LOAD RESISTANCE () 10 100k
1637 G16
OUTPUT IMPEDANCE ()
900 800 700 600
UW
45
1637 G13
Gain-Bandwidth Product vs Temperature
120 100 80 60 40 20 0
PHASE SHIFT (DEG) PHASE MARGIN (DEG)
PHASE MARGIN (DEG)
Slew Rate vs Temperature
0.7 0.6 RISING, VS = 15V
1300 1200 VS = 15V
0.5 0.4 0.3 0.2 0.1 - 50
RISING, VS = 1.5V FALLING, VS = 15V FALLING, VS = 1.5V
VS = 1.5V
50 25 75 0 TEMPERATURE (C)
100
125
- 25
0
50 75 25 TEMPERATURE (C)
100
125
1637 G11
1637 G12
CMRR vs Frequency
90 80 70 60 50 40 30 20 10 0 -10 1k 10k 100k FREQUENCY (Hz) 1M
1637 G14
PSRR vs Frequency
VS = 2.5V
VS = 15V VS = 1.5V
POSITIVE SUPPLY
NEGATIVE SUPPLY
1k
10k 100k FREQUENCY (Hz)
1M
1637 G15
Output Impedance vs Frequency
50 45 1k 10k VS = 2.5V
Undistorted Output Swing vs Frequency
35 30 25 20 15 10 5 0 100 Vs = 2.5V Vs = 15V DISTORTION 1% AV = 1
100
AV = 100
10
AV = 10
1
AV = 1
0.1 100
1k
10k 100k FREQUENCY (Hz)
1M
1637 G17
1k 10k FREQUENCY (Hz)
100k
1637 G18
1637FB
9
LT1637 TYPICAL PERFOR A CE CHARACTERISTICS
Settling Time to 0.1% vs Output Step
10 8 6
OUTPUT STEP (V)
VS = 15V
OVERSHOOT (%)
2 0 -2 -4 -6 -8 -10 0 10 30 20 SETTLING TIME (s) 40
1637 G19
60 50 40 30 20 10 0 10
AV = 1
AV = 5
THD + NOISE (%)
4
AV = 1
AV = - 1
AV = 1
AV = - 1
Total Harmonic Distortion + Noise vs Load Resistance
1 VS = 1.5V VIN = 0.9V
0.1
THD + NOISE (%)
0.01
VS = 3V, 0V VIN = 0.6V TO 2.4V
THD + NOISE (%)
0.001 VS = 3V, 0V VIN = 0.3V TO 2.1V 0.0001 100 1k 10k LOAD RESISTANCE TO GROUND () 100k
Open-Loop Gain
CHANGE IN INPUT OFFSET VOLTAGE (50V/DIV) VS = 15V A B C A: RL = 2k B: RL = 10k C: RL = 50k 0V 10V -10V OUTPUT VOLTAGE (5V/DIV)
1637 G24
A B C
10
UW
Capacitive Load Handling, Overshoot vs Capacitive Load
100 90 80 70 VS = 2.5V NO OUTPUT COMPENSATION AV = 2
Total Harmonic Distortion + Noise vs Frequency
10 VS = 3V, 0V VOUT = 1.8VP-P VCM = 1.2V RL =10k
1
0.1
AV = 10
0.01 AV = -1 AV = 1
0.001
0.0001
100 1000 CAPACITIVE LOAD (pF) 10000
1637 G20
10
100
1k 10k FREQUENCY (Hz)
100k
1637 G21
Total Harmonic Distortion + Noise vs Output Voltage
10 RL = 10k VCM = HALF SUPPLY f = 1kHz FOR AV = -1, RG = 100k AV = 1 VS = 3V, 0V
VS = 3V TOTAL AV = 1 VIN = 1.8VP-P AT 1kHz
1
AV = -1 VS = 1.5V AV = 1 VS = 1.5V AV = 1 VS = 3V, 0V
0.1
0.01
0.001 0
AV = -1, VS = 3V, 0V 1 2 OUTPUT VOLTAGE (VP-P) 3
1637 G23
1637 G22
Large-Signal Response
VS = 15V AV = - 1 10V 50mV
Small-Signal Response
VS = 15V AV = 1
- 50mV - 10V
1637 G25
1637 G26
1637FB
LT1637
APPLICATIO S I FOR ATIO
Supply Voltage
The positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01F) within an inch of the pin. When driving heavy loads an additional 4.7F 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 1s. 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. 5 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 600V. 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 23A at room temperature. The input offset voltage is typically 600V when operating above V +. The LT1637 will operate with its input 44V above V - regardless of V +.
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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 0.22F capacitor in series with a 150 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.
1637FB
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LT1637
APPLICATIO S I FOR ATIO
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. 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 3A and the output leakage current is less than 1A, 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).
SI PLIFIED SCHE ATIC
7 V+ Q1 D1 R2 6k SHDN 5 R1 1M Q3 Q4 R5 7k Q5 Q6 Q7 Q8 D4 D5 NULL 1 R7 400 R8 400 4 V-
1637 SS
R3 1.3k - IN Q2 + IN 3 Q11 Q12 Q16 Q17 2 R4 1.3k Q9 Q10 Q14 Q15
10A
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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. 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.
LT1637 8 1 10k V-
1637 F01
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Figure 1. Input Offset Nulling
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Q13 D2
Q19 Q25 Q23 D3 Q21 Q18 Q20 Q22 Q24 6 OUT
Q26
R6 7k 8 NULL
1637FB
LT1637
TYPICAL APPLICATIO S
Positive Supply Rail Current Sense
5V
200
0.2 200 LOAD ILOAD
+
LT1637 Q1 2N3904 0V TO 4.3V 2k
1637 TA03
-
VOUT = (2)(ILOAD)
Over-The-Top Comparator with Hysteresis
1M 3V TO 44V IN1 (0V TO 44V) 10k
+
LT1637 VOUT 1M
-
2N5087 IN2 (0V TO 44V) 10k 1M
V HYSTERESIS = CC 100
2N5210
1637 TA04
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Optional Output Compensation for Capacitive Loads Greater Than 200pF
VIN
+
LT1637
-
0.22F 150
CL 4700pF
1637 TA02
Lamp Outage Detector
5V TO 44V 1M LAMP ON/OFF 100k 5k 0.5 3V
-
LT1637 OUT
+
OUT = 0V FOR GOOD BULB 3V FOR OPEN BULB
1637 TA05
Over-The-Top Current Sense
3V TO 44V R1 200 3V RS 0.2
+
LT1637
-
1M
ILOAD LOAD ILOAD = VOUT (RS)(R2/R1)
Q1 2N3904 VOUT (0V TO 2.7V) R2 2k
1637 TA06
1637FB
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LT1637
PACKAGE DESCRIPTIO
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PIN 1 PACKAGE TOP MARK OUTLINE
0.28 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
5.23 (.206) MIN
0.42 0.04 (.0165 .0015) TYP
RECOMMENDED SOLDER PAD LAYOUT DETAIL "A" 0 - 6 TYP 4.90 0.15 (1.93 .006) 3.00 0.102 (.118 .004) NOTE 4
0.254 (.010) GAUGE PLANE
0.18 (.077) SEATING PLANE 0.22 - 0.38 (.009 - .015) TYP 0.13 0.076 (.005 .003)
MSOP (MS8) 0802
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
1637FB
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DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.675 0.05 0.38 0.10 8 3.00 0.10 (4 SIDES) 1.65 0.10 (2 SIDES)
(DD8) DFN 0203
0.200 REF
0.75 0.05
4 0.28 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
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. ALL DIMENSIONS ARE IN MILLIMETERS 3. 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 4. EXPOSED PAD SHALL BE SOLDER PLATED
MS8 Package 8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 0.127 (.035 .005)
3.2 - 3.45 (.126 - .136)
0.65 (.0256) BSC
3.00 0.102 (.118 .004) (NOTE 3)
8
7 65
0.52 (.206) REF
0.53 0.015 (.021 .006) DETAIL "A"
1 1.10 (.043) MAX
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4 0.86 (.034) REF
0.65 (.0256) BSC
LT1637
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381)
(
+.035 .325 -.015 8.255 +0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
.050 BSC
8 N N .245 MIN .160 .005 .228 - .244 (5.791 - 6.197) 1 2 3 N/2
.030 .005 TYP
RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
NOTE: 1. DIMENSIONS IN
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)
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.
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N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.100 (2.54) BSC
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 7 6 5
.045 .005
.150 - .157 (3.810 - 3.988) NOTE 3 N/2
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
.016 - .050 (0.406 - 1.270)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
SO8 0502
1637FB
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LT1637
TYPICAL APPLICATIO S
Sample-and-Hold
3V VIN 3V LT1637
VSAMPLE
3V 0V
DROOP (LT1636 BUFFER): 200mV/s DROOP INTO HIGH IMPEDANCE : LESS THAN 0.625mV/s
MUX Amplifier
5V VIN1 5kHz AT 4VP-P
+
LT1637 VOUT
-
SHDN
-
LT1637 VIN2 10kHz AT 2VP-P
+
SHDN
INPUT SELECT 1kHz AT 5VP-P 74HC04
1637 TA09
RELATED PARTS
PART NUMBER
LT1078/LT1079 LT2078/LT2079 LT1178/LT1179 LT2178/LT2179 LT1366/LT1367 LT1490/LT1491 LT1636 LT1638/LT1639 LT1782 LT1783
DESCRIPTION
Dual/Quad 55A Max, Single Supply, Precision Op Amps Dual/Quad 17A Max, Single Supply, Precison Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Single Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail Input and Output Op Amps Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and Output Op Amp 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and Output Op Amp
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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150 0.22F
-
SHDN
LT1636
VOUT
-
1637 TA07
MUX Amplifier Waveforms
VOUT 2V/DIV
5V
INPUT SELECT 5V/DIV 0.2ms/DIV
1637 TA08
COMMENTS
Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 2.5V/C Drift (Max), 200kHz GBW, 0.07V/s Slew Rate Input/Output Common Mode Includes Ground, 70V VOS(MAX) and 4V/C Drift (Max), 85kHz GBW, 0.04V/s Slew Rate 475V VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW Single Supply Input Range: - 0.4V to 44V, Micropower 50A per Amplifier, Rail-to-Rail Input and Output, 200kHz GBW 55A Supply Current, VCM Extends 44V above VEE, Independent of VCC; MSOP Package, Shutdown Function 0.4V/s Slew Rate, 230A Supply Current per Amplifier SOT-23, 800V VOS(MAX), IS = 55A (Max), Gain-Bandwidth = 200kHz, Shutdown Pin SOT-23, 800V VOS(MAX), IS = 300A (Max), Gain-Bandwidth = 1.2MHz, Shutdown Pin
1637FB LT/TP 0303 1K REV B * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1999

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