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LT1101 Precision, Micropower, Single Supply Instrumentation Amplifier (Fixed Gain = 10 or 100) DESCRIPTIO
The LT(R)1101 establishes the following milestones: (1) It is the first micropower instrumentation amplifier, (2) It is the first single supply instrumentation amplifier, (3) It is the first instrumentation amplifier to feature fixed gains of 10 and/or 100 in low cost, space-saving 8-lead packages. The LT1101 is completely self-contained: no external gain setting resistor is required. The LT1101 combines its micropower operation (75A supply current) with a gain error of 0.008%, gain linearity of 3ppm, gain drift of 1ppm/C. The output is guaranteed to drive a 2k load to 10V with excellent gain accuracy. Other precision specifications are also outstanding: 50V input offset voltage, 130pA input offset current, and low drift (0.4V/C and 0.7pA/C). In addition, unlike other instrumentation amplifiers, there is no output offset voltage contribution to total error. A full set of specifications are provided with 15V dual supplies and for single 5V supply operation. The LT1101 can be operated from a single lithium cell or two Ni-Cad batteries. Battery voltage can drop as low as 1.8V, yet the LT1101 still maintains its gain accuracy. In single supply applications, both input and output voltages swing to within a few millivolts of ground. The output sinks current while swinging to ground--no external, power consuming pull down resistors are needed.
FEATURES

Gain Error: 0.04% Max Gain Nonlinearity: 0.0008% (8ppm) Max Gain Drift: 4ppm/C Max Supply Current: 105A Max Offset Voltage: 160V Max Offset Voltage Drift: 0.4V/C Typ Offset Current: 600pA Max CMRR, G = 100: 100dB Min 0.1Hz to 10Hz Noise: 0.9Vp-p Typ 2.3pAp-p Typ Gain Bandwidth Product: 250kHz Min Single or Dual Supply Operation Surface Mount Package Available
APPLICATIO S

Differential Signal Amplification in Presence of Common Mode Voltage Micropower Bridge Transducer Amplifier - Thermocouples - Strain Gauges - Thermistors Differential Voltage-to-Current Converter Transformer Coupled Amplifier 4mA to 20mA Bridge Transmitter
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
GROUND 1 (REF) 90R SHORT TO 1, 2 G = 10 N.C. G = 100
Gain Error Distribution
8 90R
PERCENT OF UNITS
30 OUTPUT 25
9R R R
9R
7 SHORT TO 8 G = 10 N.C. G = 100
20 15 10 5
-
A INVERTING 3 INPUT 4 V- B
GROUND PIN 1, OUTPUT AT PIN 8 G = 100: NO ADDITIONAL CONNECTIONS G = 10: SHORT PIN 2 TO PIN 1, SHORT PIN 7 TO PIN 8
+
+
R 9.2k
6 NONINVERTING INPUT 5+ V
0 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 GAIN ERROR (%)
LT1101 * TA02
LT1101 * TA01
U
-
U
U
G = 100 RL = 50k TA = 25C 930 UNITS TESTED IN ALL PACKAGES
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1
LT1101
ABSOLUTE
AXI U
RATI GS (Note 1)
Operating Temperature Range LT1101AM/LT1101M (OBSOLETE) ... - 55C to 125C LT1101AI/LT1101I .............................. -40C to 85C LT1101AC/LT1101C ................................ 0C to 70C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Supply Voltage ...................................................... 22V Differential Input Voltage ....................................... 36V Input Voltage ............... Equal to Positive Supply Voltage ..........10V Below Negative Supply Voltage Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
GROUND (REF) 1 REF 2 G = 10 TOP VIEW OUTPUT 8 OUT G = 10 90R 7 R
+ -
GROUND (REF) 1
90R 90R
90R R 9R
9R 6 +IN
REF G = 10 2
9R R R 9R
-IN 3
5 V+ V- 4
R 9.2k
4 V - (CASE) H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150C, JA = 150C/W, JC = 45C/W
5
V+
NC 6 V- 7 NC 8
R 9.2k
N PACKAGE 8-LEAD PDIP TJMAX = 150C, JA = 130C/W J PACKAGE 8-LEAD CERDIP TJMAX = 150C, JA = 100C/W
SW PACKAGE 16-LEAD PLASTIC SO TJMAX = 150C, JA = 100C/W
ORDER PART NUMBER LT1101AMH LT1101MH LT1101ACH LT1101CH
Consider the N8 as an Alternate Source
ORDER PART NUMBER LT1101AMJ8 LT1101MJ8 LT1101ACJ8 LT1101CJ8 LT1101AIN8 LT1101IN8 LT1101ACN8 LT1101CN8
ORDER PART NUMBER LT1101SW LT1101ISW
OBSOLETE PACKAGES
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
otherwise noted. (Note 4)
SYMBOL PARAMETER GE GNL VOS lOS IB IS Gain Error Gain Nonlinearity Input Offset Voltage LT1101SW Input Offset Current Input Bias Current Supply Current CONDITIONS
VS = 5V, 0V, VCM = 0.1V, VREF(PIN 1) = 0.1V, G = 10 or 100, TA = 25C, unless
LT11O1AM/AI/AC MIN TYP MAX 0.010 0009 20 3 50 0.13 6 75 0.050 0.040 60 7 160 0.60 8 105 LT1101M/I/C TYP MAX 0.011 0.010 20 3 60 250 0.15 6 78 0.075 0.060 75 8 220 600 0.90 10 120
MIN
G = 100, V0 = 0.1V to 3.5V, RL = 50k G = 10, V0 = 0.1V to 3.5V, RL = 50k G = 100, RL = 50k G = 10, RL = 50k (Note 2)
2
+ -
+ -
+ -
+ -
-IN 3
U
U
W
WW U
W
TOP VIEW
8
TOP VIEW OUTPUT NC 1 GND (REF) 2 OUT 7 G = 10
6 16 NC 15 OUTPUT
90R 9R R R 90R 9R
+IN
NC 3 REF 4 G = 10 -IN 5
14 NC 13 OUT 12 +IN 11 NC 10 V + 9
G = 10
+ -
NC
UNITS % % ppm ppm V V nA nA A
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LT1101
ELECTRICAL CHARACTERISTICS
otherwise noted. (Note 4)
SYMBOL PARAMETER CMRR Common Mode Rejection Ratio Minimum Supply Voltage VO Maximum 0utput Voltage Swing CONDITIONS
VS = 5V, 0V, VCM = 0.1V, VREF(PIN 1) = 0.1V, G = 10 or 100, TA = 25C, unless
LT11O1AM/AI/AC MIN TYP MAX 95 84 106 100 1.8 4.1 3.5 4.3 3.9 3.3 0.5 90 3.0 33 0.07 2.3 4.1 3.5 6 1 130 2.0 22 0.04 LT1101M/I/C TYP MAX 105 99 1.8 4.3 3.9 3.3 0.5 90 3.0 33 0.07 2.3
MIN 92 82
UNITS dB dB V V V mV mV mV kHz kHz V/s
1k Source Imbalance G = 100, VCM = 0.07V to 3.4V G = 10, VCM = 0.07V to 3.1V (Note 5) Output High, 50k to GND Output High, 2k to GND Output Low, VREF = 0, No Load Output Low, VREF = 0, 2k to GND Output Low, VREF = 0, lSINK = 100A G = 100 (Note 2) G = 10 (Note 2) (Note 2)
6 1 130
BW SR
Bandwidth Slew Rate
2.0 22 0.04
VS = 15V, VCM = 0V, TA = 25C, Gain = 10 or 100, unless otherwise noted.
SYMBOL PARAMETER GE Gain Error CONDITIONS G = 100, VO = 10V, RL = 50k G = 100, VO = 10V, RL = 2k G = 100, VO = 10V, RL = 50k or 2k G = 100, RL = 50k G = 100, RL = 2k G = 10, RL = 50k or 2k LT1101SW Input Offset Current Input Bias Current Input Resistance Common Mode Differential Mode en Input Noise Voltage Input Noise Voltage Density in Input Noise Current Input Noise Current Density lnput Voltage Range (Note 2) (Note 2) 0.1Hz to 10Hz (Note 3) fO = 10Hz (Note 3) fO = 1000Hz (Note 3) 0.1Hz to 10Hz (Note 3) fO =10Hz (Note 3) fO = 1000Hz G = 100 G = 10 CMRR Common Mode Rejection Ratio Power Supply Rejection Ratio Supply Current 1k Source Imbalance G = 100, Over CM Range G = 10, Over CM Range VS = +2.2V, -0.1V to 18V 13.0 - 14.4 11.5 - 13.0 100 84 102 4 7 0.13 6 7 12 0.9 45 43 2.3 0.06 0.02 13.8 - 14.7 12.5 - 13.3 112 100 114 92 130 1.8 64 54 4.0 0.10 13.0 - 14.4 11.5 - 13.0 98 82 100 0.60 8 3 5 LT1101AM/AI/AC MIN TYP MAX 0.008 0.011 0.008 7 24 3 50 0.040 0.055 0.040 16 45 8 160 MIN LT1101M/I/C TYP MAX 0.009 0.012 0.009 8 25 3 60 250 0.15 6 7 12 0.9 45 43 2.3 0.06 0.02 13.8 - 14.7 12.5 - 13.3 112 99 114 94 150 0.060 0.070 0.060 20 60 9 220 600 0.90 10 UNITS % % % ppm ppm ppm V V nA nA G G Vp-p nV/Hz nV/Hz pAp-p pA/Hz pA/Hz V V V V dB dB dB A
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GNL
Gain Nonlinearity
VOS lOS IB
Input Offset Voltage
PSRR IS
3
LT1101
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VO BW SR Maximum 0utput Voltage Swing Bandwidth Slew Rate CONDITIONS RL = 50k RL = 2k G = 100 (Note 2) G = 10 (Note 2)
VS = 15V, VCM = 0V, TA = 25C, Gain = 10 or 100, unless otherwise noted.
LT1101AM/AI TYP MAX 14.2 13.2 3.5 37 0.10 LT1101M/I TYP 14.2 13.2 3.5 37 0.10
MIN 13.0 11.0 2.3 25 0.06
MIN 13.0 11.0 2.3 25 0.06
MAX
UNITS V V kHz kHz V/s
VS = 15V, VCM = 0V, Gain = 10 or 100, -55C TA 125C for AM/M grades, -40C TA 85C for AI/I grades, unless otherwise noted.
SYMBOL PARAMETER GE Gain Error CONDITIONS G = 100, VO = 10V, RL = 50k G = 100, VO = 10V, RL = 5k G = 10, VO = 10V, RL = 50k or 5k G = 100, RL = 50k G = 100, RL = 5k G = 10, RL = 50k or 5k G = 100, RL = 50k G = 100, RL = 5k G = 10, RL = 50k G = 10, RL = 5k LT1101ISW VOS/T lOS lOS/T IB IB/T CMRR PSRR IS VO Input Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Common Mode Rejection Ratio Power Supply Rejection Ratio Supply Current Maximum 0utput Voltage Swing RL = 50k RL = 5k 12.5 11.0 (Note 2) G = 100, VCM = -14.4V to 13V G = 100, VCM = -13V to 11.5V VS = 3.0, -0.1V to 18V 96 80 98 (Note 2) (Note 2) LT1101ISW 0.4 0.16 0.5 7 10 111 99 110 105 14.0 13.5 165 12.5 11.0 2.0 0.80 4.0 10 25 94 78 94 MIN LT1101AM/AI TYP MAX 0.024 0.030 0.015 2 2 1 24 70 4 10 90 0.070 0.100 0.070 4 7 4 70 300 13 40 350 MIN LT1101M/I TYP 0.026 0.035 0.018 2 2 1 26 75 5 12 110 110 0.5 0.5 0.19 0.8 7 10 111 98 110 108 14.0 13.5 190 MAX 0.100 0.130 0.100 5 8 5 90 500 15 60 500 950 2.8 4.8 1.30 7.0 12 30 UNITS % % % ppm/C ppm/C ppm/C ppm ppm ppm ppm V V V/C mV/C nA pA/C nA pA/C dB dB dB A V V
ELECTRICAL CHARACTERISTICS
TCGE
Gain Error Drift (Note 2) Gain Nonlinearity
GNL
VOS
Input Offset Voltage
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4
LT1101
ELECTRICAL CHARACTERISTICS
otherwise noted.
SYMBOL PARAMETER GE Gain Error CONDITIONS
VS = 15V, VCM = 0V, Gain = 10 or 100, 0C TA 70C, unless
LT1101AC TYP 0.012 0.018 0.009 1 2 1 9 33 4 70 LT1101C/S TYP 0.014 0.020 0.010 1 2 1 10 36 4 85 300 0.5 1.2 0.17 0.8 6 10 96 80 97 148 12.5 10.5 112 99 112 100 14.1 13.0 170
MIN
MAX 0.055 0.085 0.055 4 7 4 25 75 10 250 2.0 0.70 4.0 9 25
MIN
MAX 0.080 0.100 0.080 5 9 5 35 100 11 350 800 2.8 4.5 1.10 7.0 11 30
UNITS % % % ppm/C ppm/C ppm/C ppm ppm ppm V V V/C V/C nA pA/C nA pA/C dB dB dB A V V
G = 100, VO = 10V, RL = 50k G = 100, VO = 10V, RL = 2k G = 10, VO = 10V, RL = 50k or 2k G = 100, RL = 50k G = 100, RL = 2k G = 10, RL = 50k or 5k G = 100, RL = 50k G = 100, RL = 2k G = 10, RL = 50k or 2k LT1101SW
TCGE
Gain Error Drift (Note 2) Gain Nonlinearity
GNL
VOS VOS/T lOS IOS/T IB IB/T CMRR PSRR IS VO
Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Common Mode Rejection Ratio Power Supply Rejection Ratio Supply Current Maximum 0utput Voltage Swing RL = 50k RL = 2k 12.5 10.5 (Note 2) G = 100, VCM = -14.4V to 13V G = 100, VCM = -13V to 11.5V VS = 2.5, -0.1V to 18V 98 82 100 (Note 2) (Note 2) LT1101SW
0.4 0.14 0.5 6 10 112 100 112 98 14.1 13.0
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5
LT1101
VS = 5V, 0V, VCM = 0.1V, VREF(PIN 1) = 0.1V, Gain = 10 or 100, - 40C TA 85C for AI/I grades, unless otherwise noted (Note 4).
SYMBOL PARAMETER GE TCGE GNL VOS VOS/T lOS VOS/T IB IB/T CMRR IS V0 Gain Error Gain Error Drift Gain Nonlinearity Input Offset Voltage LT1101ISW Input Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Common Mode Rejection Ratio Supply Current Maximum 0utput Voltage Swing Output High, 50k to GND Output High, 2k to GND Output Low, VREF = 0, No Load Output Low, VREF = 0, 2k to GND Output Low, VREF = 0, ISINK = 100A 3.8 3.0 (Note 2) G = 100, VCM = 0.1V to 3.2V G = 10, VCM = 0.1V to 2.9V, VREF = 0.15V 91 80 (Note 2) (Note 2) LT1101ISW 0.4 0.16 0.5 7 10 105 98 88 4.1 3.7 4.5 0.7 125 135 3.8 3.0 8 1.5 170 2.0 0.80 4.0 10 25 88 77 CONDITIONS G = 100, V0 = 0.1V to 3.5V, RL = 50k G = 10, VCM = 0.15, RL = 50k RL = 50k (Note 2) G = 100, RL = 50k G = 10, RL = 50k (Note 2) MIN LT1101AM/AI TYP MAX 0.026 0.011 1 45 4 90 0.080 0.070 4 110 13 350 MIN LT1101M/I TYP 0.028 0.014 1 48 5 110 110 0.5 0.5 0.19 0.8 7 10 104 97 92 4.1 3.7 4.5 0.7 125 160 MAX 0.120 0.100 5 140 15 500 950 2.8 4.8 1.30 7.0 12 30 UNITS % % ppm/C ppm ppm V V V/C V/C nA pA/C nA pA/C dB dB A V V mV mV mV
ELECTRICAL CHARACTERISTICS
8 1.5 170
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6
LT1101
ELECTRICAL CHARACTERISTICS
0C TA 70C, unless otherwise noted (Note 4).
SYMBOL PARAMETER GE TCGE GNL VOS VOS/T lOS IOS/T IB IB/T CMRR IS VO Gain Error Gain Error Drift Gain Nonlinearity Input Offset Voltage LT1101SW Input Offset Voltage Drift Input Offset Current Input Offset Current Drift Input Bias Current Input Bias Current Drift Common Mode Rejection Ratio Supply Current Maximum 0utput Voltage Swing Output High, 50k to GND Output High, 2k to GND Output Low, VREF = 0, No Load Output Low, VREF = 0, 2k to GND Output Low, VREF = 0, ISINK = 100A 4.0 3.3 (Note 2) G = 100, VCM = 0.07V to 3.3V G = 10, VCM = 0.07V to 3V, VREF = 0.15V 93 82 (Note 2) (Note 2) LT1101SW 0.4 0.14 0.5 6 10 105 99 80 4.2 3.8 4 0.6 100 120 4.0 3.3 7 1.2 150 2.0 0.70 4.0 9 25 90 80 CONDITIONS G = 100, VO = 0.1V to 3.5V, RL = 50k G = 10, VCM = 0.15V, RL = 50k RL = 50k (Note 2) G = 100, RL = 50k G = 10, RL = 50k (Note 2)
VS = 5V, 0V, VCM = 0.1V, VREF(PIN 1) = 0.1V, Gain = 10 or 100,
LT1101AC TYP MAX 0.017 0.010 1 25 4 70 0.065 0.060 4 80 10 250 LT1101C/S TYP 0.018 0.012 1 25 4 85 300 0.5 1.2 0.17 0.8 6 10 104 98 85 4.2 3.8 4 0.6 100 145
MIN
MIN
MAX 0.095 0.080 5 100 11 350 800 2.8 4.5 1.10 7 11 30
UNITS % % ppm/C ppm ppm V V V/C V/C nA pA/C nA pA/C dB dB A V V mV mV mV
7 1.2 150
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: This parameter is not tested. It is guaranteed by design and by inference from other tests. Note 3: This parameter is tested on a sample basis only.
Note 4: These test conditions are equivalent to VS = 4.9V, - 0.1V, VCM = 0V, VREF(PIN1) = 0V. Note 5: Minimum supply voltage is guaranteed by the power supply rejection test. The LT1101 actually works at 1.8V supply with minimal degradation in performance.
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7
LT1101 TYPICAL PERFOR A CE CHARACTERISTICS
Gain = 100 Nonlinearity Distribution
30 25 VS = 15V TA = 25C RL 50k PERCENT OF UNITS 708 UNITS TESTED IN ALL PACKAGES 50
PERCENT OF UNITS
GAIN ERROR (%)
20 15 10 5 0 0 2
6 4 8 10 12 14 GAIN NONLINEARITY (PPM)
Gain Error Over Temperature
0.05 1 2 3 4 5 6 7 G = 100, VS = 15V, RL = 2k G = 10, VS = 15V, RL = 2k G = 100, VS = 15V, RL = 5k G = 100, VS = 5V, 0V, RL = 50k 2 G = 100, VS = 15V, RL = 50k G = 10, VS = 15V, RL = 5k G = 10, VS = 15V or 5V, 0V, 3 RL = 50k 4 6 0.01 5 0 -50 -25 7 1
GAIN NONLINEARITY (PPM)
0.04
GAIN ERROR (%)
40 30 20
VOLTAGE
0.03
PERCENT OF UNITS
0.02
50 25 0 75 TEMPERATURE (C)
Supply Current vs Temperature
OFFSET CURRENT (pA)
110 100
VS = 15V 90 VS = 5V, 0V 80
INPUT BIAS CURRENT (nA)
SUPPLY CURRENT (A)
BIAS CURRENT (nA)
70 60 50 -50 -25
50 25 75 0 TEMPERATURE (C)
8
UW
16
Gain = 10 Nonlinearity Distribution
VS = 15V TA = 25C RL 2k 708 UNITS TESTED IN ALL PACKAGES 0 -0.5 -1.0 -1.5 0 -0.5 10 -1.0 18 0 -1.5 0 2 6 8 4 GAIN NONLINEARITY (PPM) 10
LT1101 * TPC02
Gain vs Frequency
G = 100 VS = 15V TA = 25C 40
40
30
30
GAIN (dB)
20
G = 10
20
10 10 100 1k 10k FREQUENCY (Hz) 100k 1M
LT1101 * TPC01
LT1101 * TPC03
Gain Nonlinearity Temperature
60 50 SEE GAIN VS T FOR DEFINITIONS
Input Offset Voltage Distribution
30
1 3 4
TA = 25C 746 UNITS MEASURED IN ALL PACKAGES EACH UNIT MEASURED AT VS = 15V, 0V AND AT VS = 15V
20
2
10
5
10 0 -50 -25
6 7
50 25 75 0 TEMPERATURE (C) 100 125
0 -200 -100 200 0 100 INPUT OFFSET VOLTAGE (V)
LT1101 * TPC06
100
125
LT1101 * TPC04
LT1101 * TPC05
Input Bias and Offset Currents vs Temperature
200
Input Bias Current vs Common Mode Voltage
0 VS = 5V, 0V
VS = 5V, 0V TO 15V IOS
150
-2 -4 -6 -8 -10 -12 -1 0 1 2 3 COMMON MODE VOLTAGE (V) 4
100
TA = 25C
TA = -55C TA = 125C
-5
IB
-6
100
125
-7 - 50 - 25
50 25 0 75 TEMPERATURE (C)
100
125
LT1101 * TPC07
LT1101 * TPC08
LT1101 * TPC09
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LT1101 TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Rejection Ratio vs Frequency
120 COMMON MODE REJECTION RATIO (dB) 100 G = 10 80 60 40 20 0 G = 100
COMMON MODE RANGE (V)
V + -1 V + -2 25C V + -3 V- 2 V- 1 V- 0 2 4 ALL TEMPERATURES G = 10 G = 10
POWER SUPPLY REJECTION RATIO (dB)
G = 100 C = 82pF PIN 1 TO PIN 2
VS = 15V TA = 25C 0.1 1 10 100 1k FREQUENCY (Hz) 10k 100k
Output Saturation vs Temperature vs Sink Current
1000 VS = 5V, 0V
V+
SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING
ISINK = 2mA
OUTPUT VOLTAGE SWING (V)
ISINK = 1mA
SATURATION VOLTAGE (mV)
100
ISINK = 100A ISINK = 10A
10
ISINK = 1A NO LOAD RL = 5k TO GROUND
1 -50 -25
0
25
50
75
TEMPERATURE (C)
LT1101 * TPC13
Capacitive Load Handling
PEAK-TO-PEAK OUTPUT SWING, VS = 15V (V) 120 100
OVERSHOOT (%)
VS = 2.0V TO 15V TA = 25C G = 10
30
TA = 25C LOAD, RL, TO GROUND 5 VS = 5V, 0V, RL 100k
PEAK-TO-PEAK OUTPUT SWING, VS = 5V, 0V (V)
OUTPUT IMPEDANCE ()
80 60 G = 100 40 20 0 0.1 1 10 CAPACITIVE LOAD (nF) 100
LT1101 * TPC16
UW
LT1101 * TPC10
Common Mode Range vs Supply Voltage
V+ G = 100 - 55C 125C 25C 125C - 55C
Power Supply Rejection Ratio vs Frequency
120 TA = 25C 100 80 60 40 20 0 NEGATIVE SUPPLY POSITIVE SUPPLY
G = 100 6 8 10 12 14 16 18 SUPPLY VOLTAGE (V)
LT1101 * TPC11
10
100
1k 10k FREQUENCY (Hz)
100k
LT1101 * TPC12
Output Voltage Swing vs Load Current
40 125C V+ -1 V+ -2 -55C 25C 30 20 10 0 -10 -20 -30 -40
Short-Circuit Current vs Time
TA = 25C, VS = 5V, 0V TA = 25C, VS = 15V
TA = 125C, VS = 5V, 0V TA = 125C, VS = 15V TA = 125C, VS = 15V
V- 2 25C V- 1
125C
TA = 5C, VS = 15V
100
125
V- 0.01 0.1 1 10 SOURCING OR SINKING LOAD CURRENT (mA)
LT1101 * TPC14
-55C
1 2 3 0 TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
LT1101 * TPC15
Undistorted Output Swing vs Frequency
1k
Output Impedance vs Frequency
20 VS = 5V, 0V, RL 1k 10 VS = 15V RL 30k 0 100 1k 10k FREQUENCY (Hz) 100 VS = 15V RL 100k
4 3 2 1 0
100
G = 100
10 G = 10 1
0.1 10 10k 100 1k FREQUENCY (Hz) 100k
LT1101 * TPC17
LT1101 * TPC18
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LT1101 TYPICAL PERFOR A CE CHARACTERISTICS
Noise Spectrum
1000
VOLTAGE NOISE DENSITY (nV/Hz) VOLTAGE NOISE DENSITY (fA/Hz)
CHANGE IN OFFSET VOLTAGE (V)
VS = 2.5V TO 15V TA = 25C CURRENT NOISE
300
100 VOLTAGE NOISE 30 1/f CORNER 0.6Hz 10 0.1 1 10 100 FREQUENCY (Hz) 1000
0.4
0.2 50s/DIV OUTPUT FROM 0V TO 4.5V, NO LOAD 0 0 1 2 3
LT1101 * TPC20 LT1101 * TPC20.1
TIME AFTER POWER ON (MINUTES)
LT1101 * TPC19
1V/DIV
Large Signal Transient Response G = 10, VS = 15V
5V/DIV
200s/DIV NO LOAD
LT1101 * TPC20.2
5V/DIV
1V/DIV
Small Signal Transient Response G = 10, VS = 5V, 0V
20mV/DIV
20mV/DIV
20s/DIV OUTPUT FROM 0.05V TO 0.15V, NO LOAD
LT1101 * TPC20.5
20s/DIV
LT1101 * TPC20.6
20V/DIV
10
UW
Warm-Up Drift
0.8 VS = 15V TA = 25C
Large Signal Transient Response G = 10, VS = 5V, 0V
WARM UP DRIFT 0.6 AT VS = 5V, 0V IS IMMEASURABLY LOW
Large Signal Transient Response G = 100, VS = 15V
Large Signal Transient Response G = 100, VS = 5V, 0V
200s/DIV NO LOAD
LT1101 * TPC20.3
100s/DIV OUTPUT FROM 0V TO 4.5V, NO LOAD
LT1101 * TPC20.4
Small Signal Transient Response G = 10, VS = 15V
Small Signal Transient Response G = 100, VS = 5V, 0V
200s/DIV OUTPUT FROM 0.05V TO 0.15V, NO LOAD (RESPONSE WITH VS = 15V, G = 100 IS IDENTICAL)
LT1101 * TPC20.7
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LT1101 TYPICAL PERFOR A CE CHARACTERISTICS
Single Supply: Minimum Common Mode Voltage vs Output Voltage
120
10
MINIMUM COMMON MODE VOLTAGE (V)
COMMON MODE VOLTAGE (V)
100 80
G = 10 25C -55C
25C
MINIMUM SUPPLY, OUTPUT SWING, COMMON MODE RANGE (V)
125C
60 25C 40
125C
-55C 20 0 G = 100 V+ = 1.8V TO 15V V- = OV 10 12
0
2
4 6 8 OUTPUT VOLTAGE (V)
APPLICATIO S I FOR ATIO
Single Supply Applications
The LT1101 is the first instrumentation amplifier which is fully specified for single supply operation, (i.e. when the negative supply is 0V). Both the input common mode range and the output swing are within a few millivolts of ground. Probably the most common application for instrumentation amplifiers is amplifying a differential signal from a transducer or sensor resistance bridge. All competitive instrumentation amplifiers have a minimum required common mode voltage which is 3V to 5V above the negative supply. This means that the voltage across the bridge has to be 6V to 10V or dual supplies have to be used (i.e., micropower) single battery usage is not attainable on competitive devices. The minimum output voltage obtainable on the LT1101 is a function of the input common mode voltage. When the common mode voltage is high and the output is low, current will flow from the output of amplifier A into the output of amplifier B. See the Minimum Output Voltage vs Common Mode Voltage plot. Similarly, the Single Supply Minimum Common Mode Voltage vs Output Voltage plot specifies the expected common mode range.
U
W
UW
LT1101 * TPC21
Single Supply: Minimum Output Voltage vs Common Mode Voltage
9 8 7 6 5 4 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 MINIMUM OUTPUT VOLTAGE (mV)
LT1101 * TPC22
Minimum Supply Voltage vs Temperature
2.5 V - = 0V
V+ = 1.8V TO 15V V- = OV NO LOAD -55C
2.0
MINIMUM SUPPLY VOLTAGE OUTPUT SWING AT MINIMUM SUPPLY
125C
25C
1.5
G = 100
-55C
125C
1.0 COMMON-MODE RANGE AT MINIMUM SUPPLY
G = 10
0.5
0 -50
-25
50 25 0 75 TEMPERATURE (C)
100
125
LT1101 * TPC23
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When the output is high and input common mode is low, the output of amplifier A has to sink current coming from the output of amplifier B. Since amplifier A is effectively in unity gain, its input is limited by its output. Common Mode Rejection vs Frequency The common mode rejection ratio (CMRR) of the LT1101 starts to roll off at a relatively low frequency. However, as shown on the Common Mode Rejection Ratio vs Frequency plot, CMRR can be enhanced significantly by connecting an 82pF capacitor between pins 1 and 2. This improvement is only available in the gain 100 configuration, and it is in excess of 30dB at 60Hz. Offset Nulling The LT1101 is not equipped with dedicated offset null terminals. In many bridge transducer or sensor applications, calibrating the bridge simultaneously eliminates the instrumentation amplifier's offset as a source of error. For example, in the Micropower Remote Temperature Sensor Application shown, one adjustment removes the offset errors due to the temperature sensor, voltage reference and the LT1101.
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LT1101
APPLICATIO S I FOR ATIO
A simple resistive offset adjust procedure is shown below. If R = 5 for G = 10, and R = 50 for G = 100, then the effect of R on gain error is approximately 0.006%. Unfortunately, about 450A has to flow through R to bias the reference terminal (Pin 1) and to null out the worstcase offset voltage. The total current through the resistor network can exceed 1mA, and the micropower advantage of the LT1101 is lost.
15V 10k 3 5 LT1101 6 8 1 4 10k 20k R OUT
- +
10k
- 15V
LT1101 * AI01
Another offset adjust scheme uses the LT1077 micropower op amp to drive the reference Pin 1. Gain error and common mode rejection are unaffected, the total current increase is 45A. The offset of the LT1077 is trimmed and amplified to match and cancel the offset voltage of the LT1101. Output offset null range is 25mV.
1.2V TO 18V 3
- +
4
5 LT1101 8 1 7 6 100k 5k POT OUT 1 8
6
+ -
3 2 3.3k
LT1077 4
-1.2V TO -18V
LT1101 * AI02
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Gains Between 10 and 100 Gains between 10 and 100 can be achieved by connecting two equal resistors (= Rx) between Pins 1 and 2 and Pins 7 and 8. Gain = 10 + Rx R+Rx/90 The nominal value of R is 9.2k. The usefulness of this method is limited by the fact that R is not controlled to better than 10% absolute accuracy in production. However, on any specific unit, 90R can be measured between Pins 1 and 2. Input Protection Instrumentation amplifiers are often used in harsh environments where overload conditions can occur. The LT1101 employs PNP input transistors, consequently the differential input voltage can be 30V (with 15V supplies, 36V with 18V supplies) without an increase in input bias current. Competitive instrumentation amplifiers have NPN inputs which are protected by back-to-back diodes. When the differential input voltage exceeds 1.3V on these competitive devices, input current increases to the milliampere level; more than 10V differential voltage can cause permanent damage. When the LT1101's inputs are pulled above the positive supply, the inputs will clamp a diode voltage above the positive supply. No damage will occur if the input current is limited to 20mA. 500 resistors in series with the inputs protect the LT1101 when the inputs are pulled as much as 10V below the negative supply.
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LT1101
APPLICATIO S I FOR ATIO
3V REMOTE TEMP SENSOR LM134-3 75k
Micropower, Battery Operated Remote Temperature Sensor
LT1004-1.2 2210 62 2k POT
75k
3
5
- +
LT1101 G = 10 2 1
6
100nA K
20k
10k
TRIM OUTPUT TO 250mV AT 25C TEMPERATURE RANGE = 2.5C TO 150C ACCURACY = 0.5C
LT1101 * AI03
Instrumentation Amplifier with 150mA Output Current
V+ = 15V
6
5
+
LT1101
7 8 4 2 1 V - = -15V
2k LT1010 OUT
3
-
GAIN = 10, DEGRADED BY 0.01% DUE TO LT1010 OUTPUT = 10V INTO 75 (TO 1.5kHz) DRIVES ANY CAPACITIVE LOAD SINGLE SUPPLY APPLICATION (V+ = 5V, V- = OV): VOUT MIN = 120mV, VOUT MAX = 3.4V
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4mA to 20mA Loop Receiver
12V 390k LT1004-1.2 ILOOP 75k 6 5
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+
LT1101
7 8 4 2 1 OUTPUT
62.5
7 8 4 OUT 10mV/C
5k 18k
3
-
4mA TO 20mA IN - OV TO 10V OUT TRIM OUTPUT TO 5V AT 12mA IN
LT1101 * AI04
Voltage Controlled Current Source
6 9V 5 LT1101 3 8 1 4 -1.5V IOUT RL IOUT = 100VIN R IOUT = 0mA TO 5mA VOLTAGE COMPLIANCE = 6.4V (R 200) R
VIN
+ -
LT1101 * AI06
LT1101 * AI05
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LT1101
APPLICATIO S I FOR ATIO
Differential Voltage Amplification from a Resistance Bridge
V+
TRANSDUCER OR SENSOR
R
R 6
RESISTANCE BRIDGE R R
MINIMUM VOLTAGE ACROSS BRIDGE = 20mV MINIMUM SUPPLY VOLTAGE = 1.8V
LT1101 * AI07
Gain = 20, 110 or 200 Instrumentation Amplifier Differential Output
6
+
LT1101 8 6
+
IN
3
-
1
-
+
OUT
-
6
+
LT1101 8 3
3
-
1 GAIN = 200, AS SHOWN GAIN = 20, SHORT PIN 1 TO PIN 2, PIN 7 TO PIN 8 ON BOTH DEVICES GAIN = 110, SHORT PIN 1 TO PIN 2, PIN 7 TO PIN 8 ON ONE DEVICE, NOT ON THE OTHER INPUT REFERRED NOISE IS REDUCED BY 2 (G = 200 OR 20)
14
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+ -
1 SHIELD 5 LT1101 G = 100 4 8 OUT 3
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Single Ended Output
+
LT1101 8 OUT
3
-
+
IN
1
-
6
+
LT1101 8
-
1
LT1101 * AI08
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LT1101
PACKAGE DESCRIPTIO
SEATING PLANE .010 - .045* (0.254 - 1.143) .016 - .021** (0.406 - 0.533)
45TYP .028 - .034 (0.711 - 0.864)
.045 - .068 (1.143 - 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC)
.008 - .018 (0.203 - 0.457)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
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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H Package 8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
.335 - .370 (8.509 - 9.398) DIA .305 - .335 (7.747 - 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 - .185 (4.191 - 4.699) REFERENCE PLANE .500 - .750 (12.700 - 19.050) .027 - .045 (0.686 - 1.143) PIN 1 .200 (5.080) TYP .110 - .160 (2.794 - 4.064) INSULATING STANDOFF *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610) H8(TO-5) 0.200 PCD 0801
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION (4 PLCS) .405 (10.287) MAX 8 7 6 5
.005 (0.127) MIN
.023 - .045 (0.584 - 1.143) HALF LEAD OPTION
.025 (0.635) RAD TYP 1 2 3
.220 - .310 (5.588 - 7.874)
4
.200 (5.080) MAX .015 - .060 (0.381 - 1.524)
0 - 15
.045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC
.125 3.175 MIN
J8 0801
OBSOLETE PACKAGES
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LT1101
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.009 - .015 (0.229 - 0.381) +.035 .325 -.015
.065 (1.651) TYP .125 (3.175) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 0502
(
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
.030 .005 TYP N
.420 MIN
1
2
3
RECOMMENDED SOLDER PAD LAYOUT 1 .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330)
NOTE 3 .016 - .050 (0.406 - 1.270)
NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
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N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.045 - .065 (1.143 - 1.651) .130 .005 (3.302 0.127) 8 .400* (10.160) MAX 7 6 5 .255 .015* (6.477 0.381) .100 (2.54) BSC 1 2 3 4
SW Package 16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005 .398 - .413 (10.109 - 10.490) NOTE 4 16 15 14 13 12 11 10 9
N .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643)
N/2
N/2
2
3
4
5
6
7
8
.093 - .104 (2.362 - 2.642)
.037 - .045 (0.940 - 1.143)
.050 (1.270) BSC
.004 - .012 (0.102 - 0.305)
.014 - .019 (0.356 - 0.482) TYP
S16 (WIDE) 0502
1101fa LW/TP 1002 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1989

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