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® INA122
INA122
INA122
Single Supply, MicroPower
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW QUIESCENT CURRENT: 60µA
q WIDE POWER SUPPLY RANGE
Single Supply: 2.2V to 36V
Dual Supply: –0.9/+1.3V to ±18V
q COMMON-MODE RANGE TO (V–)–0.1V
q RAIL-TO-RAIL OUTPUT SWING
q LOW OFFSET VOLTAGE: 250µV max
q LOW OFFSET DRIFT: 3µV/°C max
q LOW NOISE: 60nV/Hz
q LOW INPUT BIAS CURRENT: 25nA max
q 8-PIN DIP AND SO-8 SURFACE-MOUNT
VI+N 3
8
RG
1
VIN
2
V+
7
INA122
100k
25k
25k
6
VO
VO = (VI+N – VIN) G
G = 5 + 200k
RG
100k
5 Ref
APPLICATIONS
q PORTABLE, BATTERY OPERATED
SYSTEMS
q INDUSTRIAL SENSOR AMPLIFIER:
Bridge, RTD, Thermocouple
q PHYSIOLOGICAL AMPLIFIER:
ECG, EEG, EMG
q MULTI-CHANNEL DATA ACQUISITION
DESCRIPTION
The INA122 is a precision instrumentation amplifier
for accurate, low noise differential signal acquisition.
Its two-op-amp design provides excellent performance
with very low quiescent current, and is ideal for
portable instrumentation and data acquisition systems.
The INA122 can be operated with single power sup-
plies from 2.2V to 36V and quiescent current is a mere
60µA. It can also be operated from dual supplies. By
utilizing an input level-shift network, input common-
mode range extends to 0.1V below negative rail (single
supply ground).
A single external resistor sets gain from 5V/V to
10000V/V. Laser trimming provides very low offset
voltage (250µV max), offset voltage drift (3µV/°C
max) and excellent common-mode rejection.
Package options include 8-pin plastic DIP and SO-8
surface-mount packages. Both are specified for the
–40°C to +85°C extended industrial temperature range.
4
V–
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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-1388B
Printed in U.S.A. October, 1997

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SPECIFICATIONS
At TA = +25°C, VS = +5V, RL = 20kconnected to VS/2, unless otherwise noted.
INA122P, U
PARAMETER
CONDITIONS
MIN
TYP
MAX
INPUT
Offset Voltage, RTI
vs Temperature
vs Power Supply (PSRR)
Input Impedance
Safe Input Voltage
Common-Mode Voltage Range
Common-Mode Rejection
INPUT BIAS CURRENT
vs Temperature
Offset Current
vs Temperature
GAIN
Gain Equation
Gain Error
vs Temperature
Gain Error
vs Temperature
Nonlinearity
NOISE (RTI)
Voltage Noise, f = 1kHz
f = 100Hz
f = 10Hz
fB = 0.1Hz to 10Hz
Current Noise, f = 1kHz
fB = 0.1Hz to 10Hz
OUTPUT
Voltage, Positive
Negative
Short-Circuit Current
Capacitive Load Drive
FREQUENCY RESPONSE
Bandwidth, –3dB
Slew Rate
Settling Time, 0.01%
Overload Recovery
POWER SUPPLY
Voltage Range, Single Supply
Dual Supplies
Current
TEMPERATURE RANGE
Specification
Operation
Storage
Thermal Resistance, θJA
8-Pin DIP
SO-8 Surface-Mount
VS = +2.2V to +36V
RS = 0
RS = 10k
VCM = 0V to 3.4V
G=5
G=5
G = 100
G = 100
G = 100, VO = –14.85V to +14.9V
(V–)–0.3
(V–)–40
0
83
±100
±1
10
1010 || 3
96
±250
±3
30
(V+)+0.3
(V+)+40
3.4
–10 –25
±40
±1 ±2
±40
G = 5 to 10k
G = 5 + 200k/RG
±0.05
±0.1
5 10
±0.3
±0.5
±25 ±100
±0.005 ±0.012
60
100
110
2
80
2
VS = ±15V
VS = ±15V
Short-Circuit to Ground
(V+)–0.1
(V–)+0.15
(V+)–0.05
(V–)+0.1
+3/–30
1
G=5
G = 100
G = 500
G=5
G = 100
G = 500
50% Input Overload
120
5
0.9
+0.08/–0.16
350
450
1.8
3
IO = 0
+2.2
–0.9/+1.3
+5
60
–40
–55
–55
150
150
+36
±18
85
+85
+85
+125
T Specification same as INA122P, INA122U.
INA122PA, UA
MIN
TYP
MAX
±150
±500
T ±5
T 100
T
TT
TT
TT
76 90
T –50
T
T ±5
T
T
T
T ±0.15
TT
T ±1
TT
T ±0.024
T
T
T
T
T
T
TT
TT
T
T
T
T
T
T
T
T
T
T
TTT
TTT
TT
TT
TT
TT
T
T
UNITS
µV
µV/°C
µV/V
|| pF
V
V
V
dB
nA
pA/°C
nA
pA/°C
V/V
V/V
%
ppm/°C
%
ppm/°C
%
nV/Hz
nV/Hz
nV/Hz
µVp-p
fA/Hz
pAp-p
V
V
mA
nF
kHz
kHz
kHz
V/µs
µs
µs
ms
µs
V
V
µA
°C
°C
°C
°C/W
°C/W
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.
®
INA122
2

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PIN CONFIGURATION
Top View
RG 1
VIN 2
VI+N 3
V– 4
8-Pin DIP, SO-8
8 RG
7 V+
6 VO
5 Ref
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V– .................................................................... 36V
Signal Input Terminals, Voltage(2) ....................... (V–)–0.3V to (V+)+0.3V
Current(2) ...................................................... 5mA
Output Short Circuit ................................................................. Continuous
Operating Temperature ................................................. –40°C to +125°C
Storage Temperature ..................................................... –55°C to +125°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTES: (1) Stresses above these ratings may cause permanent damage.
(2) Input terminals are internally diode-clamped to the power supply rails.
Input signals that can exceed the supply rails by more than 0.3V should be
current-limited to 5mA or less.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with ap-
propriate precautions. Failure to observe proper handling and
installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PACKAGE INFORMATION
PRODUCT
PACKAGE
PACKAGE DRAWING
NUMBER(1)
INA122PA
INA122P
INA122UA
INA122U
8-Pin DIP
8-Pin DIP
SO-8 Surface Mount
SO-8 Surface Mount
006
006
182
182
NOTE: (1) For detailed drawing and dimension table, see end of data sheet, or
Appendix C of Burr-Brown IC Data Book.
®
3 INA122

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TYPICAL PERFORMANCE CURVES
At TA = +25°C and VS = ±5V, unless otherwise noted.
70
G = 1000
60
GAIN vs FREQUENCY
50
G = 100
40
30 G = 20
20 G = 5
10
0
–10
100
1k 10k 100k
Frequency (Hz)
1M
110
100
90
80
70
60
50
40
30
20
10
0
1
COMMON-MODE REJECTION vs FREQUENCY
G = 1000
G = 100
G=5
10 100 1k 10k 100k
Frequency (Hz)
100
80
60
40
20
0
10
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 500
G = 100
G=5
100
1k
10k 100k
1M
Frequency (Hz)
100
80
60
40
20
0
1
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 500
G=5
G = 100
10 100 1k 10k 100k
Frequency (Hz)
15
10
5
0
–5
–10
–15
–15
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, VS = ±15V, G = 5
VD/2
VD/2
+
+
–+
VCM
+15V
–15V
Ref
VO
Limited by A2 output swing—see text
–10 –5
0
5
Output Voltage (V)
10
15
5
4
3
2
1
0
–1
–2
–3
–4
–5
–5
INPUT COMMON-MODE VOLTAGE
vs OUTPUT VOLTAGE, VS = ±5V, G = 5
VS = ±5V
VS = +5V/0V
VREF = 0V
Limited by A2 output swing—see text
–4 –3 –2 –1 0 1 2
Output Voltage (V)
3
VREF = 2.5V
45
®
INA122
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C and VS = ±5V, unless otherwise noted.
1000
VOLTAGE and CURRENT NOISE DENSITY
vs FREQUENCY (RTI)
100
10
1
VN
IN
10 100
Frequency (Hz)
1k
10k
SETTLING TIME vs GAIN
10
10V Step
1
0.01%
0.1%
0.1
1
10 100
Gain (V/V)
1k
10
8
6
4
2
0
–2
–4
–6
–8
–10
0
INPUT-REFERRED OFFSET VOLTAGE WARM-UP
Turn-on time 1ms. Settling time to
final value depends on Gain—see
settling time.
(Noise)
1 2 3 4 5 6 7 8 9 10
Time After Turn-On (ms)
QUIESCENT CURRENT vs TEMPERATURE
80
60
40
20
0
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
TOTAL HARMONIC DISTORTION+NOISE
vs FREQUENCY
1
0.1 G = 100
0.01
0.001
10
G=5
100 1k
Frequency (Hz)
RL =
RL = 25k
10k
V+
(V+)–1
(V+)–2
(V–)+2
(V–)+1
V–
0
OUTPUT VOLTAGE SWING
vs OUTPUT CURRENT
Sourcing Current
Sinking Current
5 10 15 20
Output Current (mA)
25
®
5 INA122