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® INA120
Precision
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW OFFSET VOLTAGE: 25µV max
q LOW OFFSET VOLTAGE DRIFT:
0.25µV/°C max
q PIN-STRAPPED GAINS: 1, 10, 100, 1000
q LOW GAIN DRIFT: 30ppm/°C max
at G = 100
q HIGH COMMON-MODE REJECTION:
106dB at 60Hz, G = 100
APPLICATIONS
q BRIDGE AMPLIFIER
q THERMOCOUPLE AMPLIFIER
q RTD SENSOR AMPLIFIER
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION SYSTEM
q SWITCHED-GAIN AMPLIFIER
Gain Sense 1 4 3 –In
Gain Set 1 5
2k
RC 8
44
X1000 9
400
X100 10
2k
X10 11
1k
1k
1k
1k
DESCRIPTION
The INA120 is a precision instrumentation amplifier
ideal for accurate signal acquisition. It combines pre-
cision, protected-input operational amplifiers, laser-
trimmed gain-setting resistors, and a high common-
mode rejection difference amplifier on a single chip.
Simple pin-strapped connections set precise gains of 1,
10, 100 or 1000. External resistors can be used to set
any gain from one to 5000. Gains can be digitally
selected with an external multiplexer. Gain-sense con-
nections on the INA120 maintain accuracy when using
multiplexer or gain-switching circuitry. Low power
dissipation and careful on-chip thermal management
reduce warm-up drift and assure excellent long-term
stability.
The INA120 is available in both plastic and ceramic
18-pin DIP packages, specified for the industrial tem-
perature range.
Offset Adjust
67
A1 Out
12
V+ V–
2 17
+
A1
20k
A2
+
20k
10k
10k
10k
A3
+
10k
1 VO
18 Com
Gain Set 2 14 15 16 +In
Gain
Sense 2
13
A2 Out
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1989 Burr-Brown Corporation
PDS-1071
Printed in U.S.A. March, 1992

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SPECIFICATIONS
At TA = +25°C and VS = ±15V unless otherwise specified.
PARAMETER
GAIN
Range of Gain
Gain Equation
Gain Error
Gain Temp Coefficient
Nonlinearity
OFFSET VOLTAGE
Initial Offset
CONDITIONS
G=1
G = 10
G = 100
G = 1000
G=1
G = 10
G = 100
G = 1000
G=1
G = 10
G = 100
G = 1000
vs Temperature
vs Power Supply
INPUT BIAS CURRENT
Initial Bias Current
vs Temperature
Initial Offset Current
vs Temperature
Impedance: Differential
Common-Mode
V
S
=
±6V
to
±18V
INPUT VOLTAGE RANGE
Range, Linear Response
CMRR (DC, 1kSource Imbalance)
G=1
G = 10
G = 100
G = 1000
NOISE
Input Voltage Noise
fB = 0.1Hz to 10Hz
Density; f = 10Hz
f = 100Hz
f = 1000Hz
Input Current Noise
fB = 0.1Hz to 10Hz
Density; f = 10Hz
f = 1kHz
Output Voltage Noise
fB = 0.1Hz to 10Hz
DYNAMIC RESPONSE
Small Signal Bandwidth (–3dB)
Slew Rate
Settling Time to 0.01%
Full Power Bandwidth, G < 200
Overload Recovery
G = 1000
G = 1000
G=1
G = 10
G = 100
G = 1000
G=1
G = 10
G = 100
G = 1000
VO = ±10V, RL = 2k
50% Overdrive
OUTPUT
Voltage, RL = 2k
Current
Short-Circuit Current
Capacitive Load, Stable Operation
Over Temperature
Over Temperature
POWER SUPPLY
Rated Voltage
Voltage Range
Supply Current
TEMPERATURE RANGE
Specification
Operation BP,AP
Operation CG,BG
Storage
V = 0V
O
INA120CG
MIN TYP MAX
INA120BG, BP
MIN TYP MAX
INA120AP
MIN TYP MAX
UNITS
1 1000
1 + (2RF/RG)
0.01 0.05
0.05
0.1
0.1 0.2
0.3 0.5
4 10
4 10
6 30
22 50
0.001 0.005
0.002 0.005
0.004 0.01
0.008 0.05
1 1000
1 + (2RF/RG)
0.01 0.05
0.05
0.2
0.1 0.3
0.3 1
4 20
4 20
6 40
22 50
0.001 0.01
0.002 0.01
0.004 0.02
0.008 0.1
1 1000
1 + (2RF/RG)
0.02
0.1
0.1 0.2
0.2 0.5
0.5 1
6 20
8 40
10 60
40 100
0.001 0.01
0.002 0.01
0.004 0.02
0.008 0.1
V/V
V/V
%
%
%
%
ppm/°C
ppm/°C
ppm/°C
ppm/°C
% of FS
% of FS
% of FS
% of FS
(10+ (25+
300/G) 600/G)
(.25 + 10/G)
(1 + 20/G)(10 + 150/G)
(50+ (100+
300/G) 1000/G)
(1 + 20/G)
(1 + 20/G)(20 + 250/G)
(50+ (200+
µV
600/G) 2000/G)
(2 + 20/G)
µV/°C
(1 + 20/G)(40 + 300/G) µV/V
±7
±0.2
±5
±0.2
1010 || 3
1010 || 3
±20
±10
±7
±0.2
±5
±0.2
1010 || 3
1010 || 3
±20
±20
±20
±0.2
±10
±0.2
1010 || 3
1010 || 3
±50
±50
nA
nA/°C
nA
nA/°C
|| pF
|| pF
±10 ±12.5
80 90
96 106
106 110
106 110
±10 ±12.5
74 90
90 106
106 110
106 110
±10 ±12.5
70 85
86 95
100 105
100 105
V
dB
dB
dB
dB
0.7
14
11
10
50
1.8
0.4
8
2
200
20
2
0.4 0.6
24
30
50
200
9
2
±10.5
5
±12.8
15
24
4000
0.7
14
11
10
50
1.8
0.4
8
2
200
20
2
0.4 0.6
24
30
50
200
9
2
±10.5
5
±12.8
15
24
4000
0.7
14
11
10
50
1.8
0.4
8
2
200
20
2
0.4 0.6
24
30
50
200
9
2
±10.5
5
±12.8
15
24
4000
µV p-p
nV/Hz
nV/Hz
nV/Hz
pAp-p
pA/Hz
pA/Hz
µVp-p
MHz
kHz
kHz
kHz
V/µs
µs
µs
µs
µs
kHz
µs
V
mA
mA
pF
±15 ±15 ±15
±6 ±18 ±6 ±18 ±6 ±18
±2.7 ±4
±2.7 ±4
±2.7
±4
–25 +85 –25 +85 –25 +85
–40 +85 –40 +85
–55 +125 –55 +125
–65 +150 –65 +150 –65 +150
See Absolute Maximum Table.
V
V
mA
°C
°C
°C
°C
®
INA120
2

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PIN CONFIGURATION
Top View
VO 1
V+ 2
–VIN
Gain Sense 1
3
4
Gain Set 1 5
Offset Adjust 6
Offset Adjust 7
RC 8
X1000 9
DIP
18 Com
17 V–
16 +VIN
15 Gain Sense 2
14 Gain Set 2
13 A 2 Out
12 A1 Out
11 X10
10 X100
ORDERING INFORMATION
MODEL
INA120AP
INA120BP
INA120BG
INA120CG
PACKAGE
18-Pin Plastic DIP
18-Pin Plastic DIP
18-Pin Ceramic DIP
18-Pin Ceramic DIP
TEMPERATURE RANGE
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
–25°C to +85°C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................................................................................... ±18V
Input Voltage Range .................................................. (V+) +2 to (V–) –2V
Differential Input Voltage ....................................................... Total VS +4V
Operating Temperature
Ceramic G Package .................................................... –65°C to +150°C
Plastic P Package ........................................................ –40°C to +125°C
Storage Temperature
Ceramic G Package .................................................... –65°C to +150°C
Plastic P Package ........................................................ –40°C to +125°C
Junction Temperature
Ceramic G Package ................................................................... +175°C
Plastic P Package ....................................................................... +125°C
Lead Temperature (soldering, 10s) ............................................... +300°C
PACKAGE INFORMATION(1)
MODEL
PACKAGE
PACKAGE DRAWING
NUMBER
INA120AP
INA120BP
INA120BG
INA120CG
18-Pin Plastic DIP
18-Pin Plastic DIP
18-Pin Ceramic DIP
18-Pin Ceramic DIP
218
218
158
158
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
3 INA120

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TYPICAL PERFORMANCE CURVES
TA = +25°C, VS = ±15V unless otherwise noted.
GAIN vs FREQUENCY
10k
G = 1000
1k
G = 100
100
G = 10
10
G=1
1
10 100
1k 10k 100k 1M 10M
Frequency (Hz)
400
300
200
100
0
1
SETTLING TIME vs GAIN (0.1%)
10 100
Gain (V/V)
1000
160
120
80
40
0
–40
1
COMMON-MODE REJECTION
vs FREQUENCY
G = 1000
G = 10
RS = 0
G = 100
G=1
10 100 1k 10k 100k 1M
Frequency (Hz)
COMMON-MODE REJECTION
vs SOURCE RESISTANCE IMBALANCE
160
G = 1000, G = 100
120
G = 10
80
G=1
40
f = 60Hz
0
100
1k 10k
Source Resistance Imbalance ()
100k
140
120
100
80
60
40
20
0
1
POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000
±VS
G = 10
G=1
G = 100
10 100 1k 10k 100k 1M
Frequency (Hz)
INPUT BIAS AND OFFSET CURRENT
vs TEMPERATURE
20
15
10
IB
5
0
–75
IOS
–50 –25 0 +25 +50 +75 +100 +125
Ambient Temperature (°C)
®
INA120
4

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TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, VS = ±15V unless otherwise noted.
QUIESCENT CURRENT vs TEMPERATURE
3
2.8
2.6
2.4
2.2
2.0
–75
–50 –25 0 +25 +50 +75 +100 +125
Ambient Temperature (°C)
SLEW RATE vs TEMPERATURE
1
0.8
0.6
0.4
Output
Op Amp
0.2
0
–75
–50 –25 0 +25 +50 +75 +100 +125
Ambient Temperature (°C)
CURRENT LIMIT vs TEMPERATURE
35
30
Output
Op Amp
25
20
15
–75
–50 –25 0 +25 +50 +75 +100 +125
Ambient Temperature (°C)
INPUT-REFERRED NOISE
G = 1000
Time (2s/ Division)
SMALL-SIGNAL TRANSIENT RESPONSE
G=1
LARGE-SIGNAL TRANSIENT
RESPONSE G = 1
Time (20µs/ Division)
Time (20µs/ Division)
®
5 INA120