IN A
126
INA
212
6
INA
126
INA
212
INA126
INA2126
INA
212
6
6
SBOS062A – JANUARY 1996 – REVISED AUGUST 2005
Micro
POWER
INSTRUMENTATION AMPLIFIER
Single and Dual Versions
DESCRIPTION
The INA126 and INA2126 are precision instrumentation ampli-
fiers for accurate, low noise differential signal acquisition. Their
two-op-amp design provides excellent performance with very
low quiescent current (175µA/channel). This, combined with a
wide operating voltage range of
±1.35V
to
±18V,
makes them
ideal for portable instrumentation and data acquisition sys-
tems.
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 specified
for the –40°C to +85°C industrial temperature range.
V+
INA2126
+
V
IN
2
3
9
6
40kΩ
10kΩ
R
G
7
+
–
V
O
= (V
IN
– V
IN
) G
G=5+
80kΩ
R
G
FEATURES
q
LOW QUIESCENT CURRENT: 175
µ
A/chan.
q
WIDE SUPPLY RANGE:
±
1.35V to
±
18V
q
LOW OFFSET VOLTAGE: 250
µ
V max
q
LOW OFFSET DRIFT: 3
µ
V/
°
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
V+
7
INA126
V+
3
6
8
40kΩ
10kΩ
R
G
10kΩ
1
+
–
V
O
= (V
IN
– V
IN
) G
G=5+
80kΩ
R
G
IN
4
–
V
IN
1
10kΩ
40kΩ
15
5
11
+
V
IN
14
40kΩ
10kΩ
10
R
G
–
+
V
O
= (V
IN
– V
IN
) G
G=5+
80kΩ
R
G
–
V
IN
2
40kΩ
5
13
–
V
IN
16
8
V–
10kΩ
4
V–
40kΩ
12
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1996-2005, Texas Instruments Incorporated
www.ti.com
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. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate 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.
PIN CONFIGURATION (Single)
Top View
8-Pin DIP, SO-8, MSOP-8
PACKAGE/ORDERING INFORMATION
R
G
V
–IN
V
+
IN
1
2
3
4
8
7
6
5
R
G
V+
V
O
Ref
PRODUCT
Single
INA126PA
INA126P
INA126UA
INA126U
INA126EA
(2)
PACKAGE-LEAD
PACKAGE
MARKING
V–
DIP-8
DIP-8
SO-8
SO-8
MSOP-8
INA126PA
INA126P
INA126UA
INA126U
A26
(3)
PIN CONFIGURATION (Dual)
Top View
16-Pin DIP, SO-16, SSOP-16
"
INA126E
(2)
"
MSOP-8
"
A26
(3)
"
Dual
INA2126PA
INA2126P
INA2126UA
INA2126U
INA2126EA
(2)
"
"
–
V
INA
+
V
INA
1
2
3
4
5
6
7
8
16
–
V
INB
DIP-16
DIP-16
SO-16
SO-16
SSOP-16
INA2126PA
INA2126P
INA2126UA
INA2126U
INA2126EA
+
15 V
INB
R
GA
R
GA
Ref
A
V
OA
Sense
A
V–
14 R
GB
13 R
GB
12 Ref
B
11 V
OB
10 Sense
B
9
V+
"
INA2126E
(2)
"
SSOP-16
"
INA2126E
"
"
"
NOTES: (1) For the most current package and ordering information, see the
Package Option Addendum at the end of this document, or see the TI website
at www.ti.com. (2) MSOP-8 and SSOP-16 packages are available only on 250
or 2500 piece reels. (3) Grade designation is marked on reel.
2
INA126, INA2126
www.ti.com
SBOS062A
ELECTRICAL CHARACTERISTICS
At T
A
= +25°C, V
S
=
±15V,
R
L
= 25kΩ, unless otherwise noted.
INA126P, U, E
INA2126P, U, E
PARAMETER
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
f
B
= 0.1Hz to 10Hz
Current Noise, f = 1kHz
f
B
= 0.1Hz to 10Hz
OUTPUT
Voltage, Positive
Negative
Short-Circuit Current
Capacitive Load Drive
FREQUENCY RESPONSE
Bandwidth, –3dB
R
L
= 25kΩ
R
L
= 25kΩ
Short-Circuit to Ground
CONDITIONS
MIN
TYP
±100
±0.5
5
9
|| 4
10
(V–)–0.5
(V–)–10
±11.25
83
80
MAX
±250
±3
15
(V+)+0.5
(V+)+10
±11.5
130
94
94
–10
±30
±0.5
±10
–25
±2
✻
✻
✻
74
INA126PA, UA, EA
INA2126PA, UA, EA
MIN
TYP
±150
✻
✻
✻
MAX
±500
±5
50
✻
✻
✻
90
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
±18
±200
+85
+125
+125
100
150
200
80
100
100
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
–50
±5
UNITS
µV
µV/°C
µV/V
Ω
|| 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
µV
PP
fA/√Hz
pA
PP
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
V
S
=
±1.35V
to
±18V
R
S
= 0
R
S
= 1kΩ
V
O
= 0V
G = 5, dc
R
S
= 0, V
CM
=
±11.25V
V
O
=
±14V,
G = 5
G=5
V
O
=
±12V,
G = 100
G = 100
G = 100, V
O
=
±14V
G = 5 to 10k
G = 5 + 80kΩ/R
G
±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
±0.18
✻
±1
✻
✻
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,
θ
JA
8-Pin DIP
SO-8 Surface-Mount
MSOP-8 Surface-Mount
16-Pin DIP (dual)
SO-16 (dual)
SSOP-16 (dual)
G=5
G = 100
G = 500
V
O
=
±10V,
G = 5
10V Step, G = 5
10V Step, G = 100
10V Step, G = 500
50% Input Overload
I
O
= 0
–40
–55
–55
✻
✻
✻
✻
Specification same as INA126P, INA126U, INA126E; INA2126P, INA2126U, INA2126E.
INA126, INA2126
SBOS062A
www.ti.com
3
TYPICAL CHARACTERISTICS
At T
A
= +25°C and V
S
=
±15V,
unless otherwise noted.
GAIN vs FREQUENCY
70
110
G = 1000
100
60
50
COMMON-MODE REJECTION vs FREQUENCY
Common-Mode Rejection (dB)
90
80
70
60
50
40
30
20
10
0
G=5
G = 100
G = 1000
Gain (dB)
40
30
20
10
0
–10
100
G = 100
G = 20
G=5
1k
10k
Frequency (Hz)
100k
1M
10
100
1k
10k
100k
1M
Frequency (Hz)
POSITIVE POWER SUPPLY REJECTION
vs FREQUENCY
120
G = 1000
Power Supply Rejection (dB)
120
NEGATIVE POWER SUPPLY REJECTION
vs FREQUENCY
80
60
40
20
0
10
100
1k
10k
G=5
G = 100
Power Supply Rejection (dB)
100
100
80
60
G = 100
40
20
0
G=5
G = 1000
100k
1M
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
INPUT COMMON-MODE RANGE
vs OUTPUT VOLTAGE, V
S
= ±15V
15
INPUT COMMON-MODE VOLTAGE RANGE
vs OUTPUT VOLTAGE, V
S
= ±5V
5
Common-Mode Voltage (V)
10
5
V
D/2
0
+
+
–
+
–
Input Common-Mode Voltage (V)
tput swing—se
Limited by A
2
ou
e text
4
3
2
1
0
–1
–2
–3
–4
–5
–5
–4
text
tput swing—see
Limited by A
2
ou
V
S
= ±5V
V
S
= +5V/0V
V
REF
= 2.5V
+15V
V
O
Ref
–15V
V
D/2
V
CM
–5
–10
–15
–15
tput swing—se
Limited by A
2
ou
–10
–5
0
5
10
e text
15
text
tput swing—see
Limited by A
2
ou
–3
–2
–1
0
1
2
3
4
5
Output Voltage (V)
Output Voltage (V)
4
INA126, INA2126
www.ti.com
SBOS062A
TYPICAL CHARACTERISTICS
At T
A
= +25°C and V
S
=
±15V,
unless otherwise noted.
(Cont.)
INPUT-REFERRED NOISE vs FREQUENCY
100
Input Voltage Noise (nV/√Hz)
SETTLING TIME vs GAIN
1k
Input Current Noise (fA/√Hz)
1000
0.01%
Voltage Noise
10
100
Settling Time (µs)
0.1%
100
Current Noise
1
1
10
100
Frequency (Hz)
1k
10k
10
10
1
10
Gain (V/V)
100
1k
INPUT-REFERRED OFFSET VOLTAGE WARM-UP
10
8
Offset Voltage Change (µV)
300
250
QUIESCENT CURRENT AND SLEW RATE
vs TEMPERATURE
–SR
0.6
0.5
0.4
0.3
0.2
0.1
0
125
Quiescent Current (µA)
6
4
2
0
–2
–4
–6
–8
–10
0
1
2
3
4
5
6
7
8
9
10
Time After Turn-On (ms)
(Noise)
200
150
100
50
0
–75
–50
–25
0
25
50
75
100
Temperature (°C)
I
Q
V
S
= ±1.35V
V
S
= ±5V
TOTAL HARMONIC DISTORTION+NOISE
vs FREQUENCY
1
V+
OUTPUT VOLTAGE SWING
vs OUTPUT CURRENT
(V+)–1
THD+N (%)
0.1
R
L
= 10kΩ
Sourcing Current
Output Voltage (V)
(V+)–2
(V–)+2
0.01
R
L
= 100kΩ
G=5
0.001
10
100
Frequency (Hz)
1k
10k
(V–)+1
Sinking Current
V–
0
1
2
3
4
5
Output Current (mA)
INA126, INA2126
SBOS062A
www.ti.com
5
Slew Rate (V/µs)
+SR
FPGA/CPLD
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