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©1997 Burr-Brown Corporation PDS-1361B Printed in U.S.A., February, 1998
®
INA125
INSTRUMENTATION AMPLIFIER
With Precision Voltage Reference
FEATURES
● LOW QUIESCENT CURRENT: 460µA
● PRECISION VOLTAGE REFERENCE:
1.24V, 2.5V, 5V or 10V
● SLEEP MODE
● LOW OFFSET VOLTAGE: 250
µV max
● LOW OFFSET DRIFT: 2
µV/°C max
● LOW INPUT BIAS CURRENT: 20nA max
● HIGH CMR: 100dB min
● LOW NOISE: 38nV/√Hz at f = 1kHz
● INPUT PROTECTION TO
±40V
● WIDE SUPPLY RANGE
Single Supply: 2.7V to 36V
Dual Supply:
±1.35V to ±18V
● 16-PIN DIP AND SO-16 SOIC PACKAGES
APPLICATIONS
● PRESSURE AND TEMPERATURE BRIDGE
AMPLIFIERS
● INDUSTRIAL PROCESS CONTROL
● FACTORY AUTOMATION
● MULTI-CHANNEL DATA ACQUISITION
● BATTERY OPERATED SYSTEMS
● GENERAL PURPOSE INSTRUMENTATION
DESCRIPTION
The INA125 is a low power, high accuracy instrumen-
tation amplifier with a precision voltage reference. It
provides complete bridge excitation and precision dif-
ferential-input amplification on a single integrated
circuit.
A single external resistor sets any gain from 4 to
10,000. The INA125 is laser-trimmed for low offset
voltage (250µV), low offset drift (2µV/°C), and high
common-mode rejection (100dB at G = 100). It oper-
ates on single (+2.7V to +36V) or dual (±1.35V to
±18V) supplies.
The voltage reference is externally adjustable with pin-
selectable voltages of 2.5V, 5V, or 10V, allowing use
with a variety of transducers. The reference voltage is
accurate to ±0.5% (max) with ±35ppm/°C drift (max).
Sleep mode allows shutdown and duty cycle operation
to save power.
The INA125 is available in 16-pin plastic DIP and
SO-16 surface-mount packages and is specified for
the –40°C to +85°C industrial temperature range.
A
1
Ref
Amp
10V
A
2
30kΩ
10kΩ
10kΩ
30kΩ
Bandgap
V
REF
13
12
1
14
15
16
4
6
9
10
11
IA
REF
5
8
7
R
G
Sense
R
R
2R
4R
INA125
V
REF
COM
V
REF
BG
V
REF
2.5
V
REF
5
V
REF
10
V
REF
Out
V
IN
V+
+
V
IN
–
2
SLEEP
3
V–
V
O
= (V
IN
– V
IN
) G
G = 4 + 60kΩ
+
–
R
G
V
O
INA125
INA125
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
SBOS060
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