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®
INA126
INA2126
INA126
INA2126
INA2126
INA126
INA2126
MicroPOWER INSTRUMENTATION AMPLIFIER
Single and Dual Versions
FEATURES
DESCRIPTION
q LOW QUIESCENT CURRENT: 175µA/chan.
q WIDE SUPPLY RANGE: ±1.35V to ±18V
q LOW OFFSET VOLTAGE: 250µV max
q LOW OFFSET DRIFT: 3µV/°C max
q LOW NOISE: 35nV/Hz
q LOW INPUT BIAS CURRENT: 25nA max
q 8-PIN DIP, SO-8, MSOP-8 SURFACE- MOUNT
DUAL: 16-Pin DIP, SO-16, SSOP-16
APPLICATIONS
q INDUSTRIAL SENSOR AMPLIFIER:
Bridge, RTD, Thermocouple
q PHYSIOLOGICAL AMPLIFIER:
ECG, EEG, EMG
q MULTI-CHANNEL DATA ACQUISITION
q PORTABLE, BATTERY OPERATED SYSTEMS
VI+N 3
8
RG
1
VIN 2
V+
7
INA126
6
40k
10k
VO = (VI+N – VIN) G
G = 5 + 80k
RG
10k
40k
4
5
The INA126 and INA2126 are precision instrumentation
amplifiers for accurate, low noise differential signal acquisi-
tion. Their two-op-amp design provides excellent perfor-
mance with very low quiescent current (175µA/chan.). This,
combined with wide operating voltage range of ±1.35V to
±18V, makes them ideal for portable instrumentation and data
acquisition systems.
Gain can be set from 5V/V to 10000V/V with a single
external resistor. Laser trimmed input circuitry provides
low offset voltage (250µV max), low offset voltage drift
(3µV/°C max) and excellent common-mode rejection.
Single version package options include 8-pin plastic DIP,
SO-8 surface mount, and fine-pitch MSOP-8 surface-mount.
Dual version is available in the space-saving SSOP-16 fine-
pitch surface mount, SO-16, and 16-pin DIP. All are speci-
fied for the –40°C to +85°C industrial temperature range.
V+
VI+N 2
4
RG
INA2126 9
6
40k
10k
7
VO = (VI+N – VIN) G
G=5+
80k
RG
3
VIN 1
VI+N 15
13
RG
10k
40k
40k
10k
5
11 VO = (VI+N – VIN) G
10
G=5+
80k
RG
14
VIN 16
8
10k
40k
12
V–
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
©1996 Burr-Brown Corporation
PDS-1365C
Printed in U.S.A. September, 1997

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SPECIFICATIONS
At TA = +25°C, VS = ±15V, RL = 25k, unless otherwise noted.
INA126P, U, E
INA2126P, U, E
PARAMETER
CONDITIONS
MIN
TYP
MAX
INPUT
Offset Voltage, RTI
vs Temperature
vs Power Supply (PSRR)
Input Impedance
Safe Input Voltage
Common-Mode Voltage Range
Channel Separation (dual)
Common-Mode Rejection
INA2126U (dual SO-16)
INPUT BIAS CURRENT
vs Temperature
Offset Current
vs Temperature
GAIN
Gain Equation
Gain Error
vs Temperature
Gain Error
vs Temperature
Nonlinearity
NOISE
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
Current (per channel)
TEMPERATURE RANGE
Specification Range
Operation Range
Storage Range
Thermal Resistance, θJA
8-Pin DIP
SO-8 Surface-Mount
MSOP-8 Surface-Mount
16-Pin DIP (dual)
SO-16 (dual)
SSOP-16 (dual)
VS = ±1.35V to ±18V
RS = 0
RS = 1k
VO = 0V
G = 5, dc
RS = 0, VCM = ±11.25V
VO = ±14V, G = 5
G=5
VO = ±12V, G = 100
G = 100
G = 100, VO = ±14V
RL = 25k
RL = 25k
Short-Circuit to Ground
G=5
G = 100
G = 500
VO = ±10V, G = 5
10V Step, G = 5
10V Step, G = 100
10V Step, G = 500
50% Input Overload
IO = 0
(V–)–0.5
(V–)–10
±11.25
83
80
±100
±0.5
5
109 || 4
±11.5
130
94
94
±250
±3
15
(V+)+0.5
(V+)+10
–10 –25
±30
±0.5
±2
±10
G = 5 to 10k
G = 5 + 80k/RG
±0.02
±0.1
±2 ±10
±0.2
±0.5
±25 ±100
±0.002 ±0.012
35
35
45
0.7
60
2
(V+)–0.9 (V+)–0.75
(V–)+0.95 (V–)+0.8
+10/–5
1000
200
9
1.8
0.4
30
160
1500
4
±1.35
±15
±175
±18
±200
–40 +85
–55 +125
–55 +125
100
150
200
80
100
100
T Specification same as INA126P, INA126U, INA126E; INA2126P, INA2126U, INA2126E.
INA126PA, UA, EA
INA2126PA, UA, EA
MIN
TYP
MAX
±150
±500
T ±5
T 50
T
TT
TT
TT
74 90
T –50
T
T ±5
T
T
T
T ±0.18
TT
T ±1
TT
TT
T
T
T
T
T
T
TT
TT
T
T
T
T
T
T
T
T
T
T
TTT
TT
TT
TT
TT
T
T
T
T
T
T
UNITS
µV
µV/°C
µV/V
|| pF
V
V
V
dB
dB
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
pF
kHz
kHz
kHz
V/µs
µs
µs
µs
µs
V
µA
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
°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.
®
INA126, INA2126
2

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PIN CONFIGURATION (Single)
Top View
8-Pin DIP, SO-8, MSOP-8
RG 1
V–IN 2
V+IN 3
V– 4
8 RG
7 V+
6 VO
5 Ref
PIN CONFIGURATION (Dual)
Top View
16-Pin DIP, SO-16, SSOP-16
VI–NA 1
VI+NA 2
RGA 3
RGA 4
RefA 5
VOA 6
SenseA 7
V– 8
16 VI–NB
15 VI+NB
14 RGB
13 RGB
12 RefB
11 VOB
10 SenseB
9 V+
ABSOLUTE MAXIMUM RATINGS(1)
Power Supply Voltage, V+ to V– ........................................................ 36V
Input Signal Voltage(2) ........................................... (V–)–0.7 to (V+)+0.7V
Input Signal Current(2) ...................................................................... 10mA
Output Short Circuit ................................................................. Continuous
Operating Temperature ................................................. –55°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 signal voltage is limited by internal diodes connected to power
supplies. See text.
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
Single
INA126PA
INA126P
INA126UA
INA126U
INA126EA(2)
"
INA126E(2)
"
Dual
PACKAGE
8-Pin DIP
8-Pin DIP
SO-8
SO-8
MSOP-8
"
MSOP-8
"
PACKAGE DRAWING
NUMBER(1)
PACKAGE MARKING
ORDERING NUMBER
006
INA126PA
INA126PA
006
INA126P
INA126P
182
INA126UA
INA126UA
182
INA126U
INA126U
337
A26(3)
INA126EA-250
" " INA126EA-2500
337
A26(3)
INA126E-250
" " INA126E-2500
TRANSPORT
MEDIA
Rails
Rails
Rails or Reel
Rails or Reel
Reel Only
"
Reel Only
"
INA2126PA
INA2126P
INA2126UA
INA2126U
INA2126EA(2)
"
INA2126E(2)
"
16-Pin DIP
16-Pin DIP
SO-16
SO-16
SSOP-16
"
SSOP-16
"
180
INA2126PA
INA2126PA
Rails
180
INA2126P
INA2126P
Rails
265
INA2126UA
INA2126UA
Rails
265
INA2126U
INA2126U
Rails
322
INA2126EA
INA2126EA-250
Reel Only
" " INA2126EA-2500 "
322
INA2126E
INA2126E-250
Reel Only
" " INA2126E-2500 "
NOTES: (1) For detailed drawing and dimension table, see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) MSOP-8 and SSOP-16 packages are
available only on 250 or 2500 piece reels. (3) Grade designation is marked on reel.
®
3 INA126, INA2126

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TYPICAL PERFORMANCE CURVES
At TA = +25°C and VS = ±15V, 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
10
COMMON-MODE REJECTION vs FREQUENCY
G = 1000
G = 100
G=5
100 1k 10k 100k
Frequency (Hz)
1M
120
100
80
60
40
20
0
10
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000
G = 100
G=5
100
1k
10k 100k
1M
Frequency (Hz)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, VS = ±15V
15
Limited by A2 output swing—see text
10
5
0
–5
–10
–15
–15
VD/2
VD/2
+
+
–+
VCM
+15V
–15V
Ref
VO
Limited by A2 output swing—see text
–10 –5
0
5 10 15
Output Voltage (V)
120
100
80
60
40
20
0
10
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
G = 1000
G = 100
G=5
100
1k
10k 100k
1M
Frequency (Hz)
5
4
3
2
1
0
–1
–2
–3
–4
–5
–5
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE, VS = ±5V
Limited by A2 output swing—see text
VS = ±5V
VS = +5V/0V
VREF = 2.5V
Limited by A2 output swing—see text
–4 –3 –2 –1 0 1 2 3 4
Output Voltage (V)
5
®
INA126, INA2126
4

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TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C and VS = ±15V, unless otherwise noted.
INPUT-REFERRED NOISE vs FREQUENCY
100 1k
Voltage Noise
10
Current Noise
100
1 10
1 10 100 1k 10k
Frequency (Hz)
1000
100
10
1
SETTLING TIME vs GAIN
0.01%
0.1%
10 100
Gain (V/V)
1k
10
8
6
4
2
0
–2
–4
–6
–8
–10
0
INPUT-REFERRED OFFSET VOLTAGE WARM-UP
(Noise)
12345 6789
Time After Turn-On (ms)
10
TOTAL HARMONIC DISTORTION+NOISE
vs FREQUENCY
1
0.1
0.01
0.001
10
RL = 10k
G=5
RL = 100k
100 1k
Frequency (Hz)
10k
QUIESCENT CURRENT AND SLEW RATE
vs TEMPERATURE
300 0.6
–SR
250 0.5
+SR
200 0.4
150 0.3
VS = ±1.35V
100 IQ VS = ±5V 0.2
50 0.1
0
–75 –50 –25
0 25 50
Temperature (°C)
0
75 100 125
V+
(V+)–1
(V+)–2
(V–)+2
(V–)+1
V–
0
OUTPUT VOLTAGE SWING
vs OUTPUT CURRENT
Sourcing Current
Sinking Current
1 234
Output Current (mA)
5
®
5 INA126, INA2126