INSTRUMENTATION AMPLIFIER
With Precision Voltage Reference
FEATURES
LOW QUIESCENT CURRENT: 460 A
PRECISION VOLTAGE REFERENCE:
1.24V, 2.5V, 5V or 10V
SLEEP MODE
LOW OFFSET VOLTAGE: 250 V max
LOW OFFSET DRIFT: 2 V/ 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
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 (250 V), low offset drift (2 V/ 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.
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
SBOS060
®
APPLICATIONS
PRESSURE AND TEMPERATURE BRIDGE
AMPLIFIERS
INDUSTRIAL PROCESS CONTROL
FACTORY AUTOMATION
MULTI-CHANNEL DATA ACQUISITION
BATTERY OPERATED SYSTEMS
GENERAL PURPOSE INSTRUMENTATION
V
V
REF
V
REF
V
REF
10V
PDS-1361B
INA125
SLEEP
V+
1
2
INA125
COM
12
REF
R
13
BG
R
14
2.5
2R
15
5
4R
V
10
16
REF
4
Ref
Amp
Bandgap
V
Out
REF
V
REF
+
V
IN
10
6
A
1
9
30k
11
Sense
10k
R
G
10k
V
= (V
O
8
G = 4 + 60k
A
2
7
–
V
IN
30k
IA
REF
5
3
V–
Printed in U.S.A., February, 1998
V
O
+
–
– V
) G
IN
IN
R
G