PDS-1361B

Printed in U.S.A., February, 1998

®

INA125

INSTRUMENTATION AMPLIFIER

With Precision Voltage Reference

FEATURES

q LOW QUIESCENT CURRENT: 460

q PRECISION VOLTAGE REFERENCE:

1.24V, 2.5V, 5V or 10V

q SLEEP MODE

q LOW OFFSET VOLTAGE: 250

q LOW OFFSET DRIFT: 2

q LOW INPUT BIAS CURRENT: 20nA max

q HIGH CMR: 100dB min

q LOW NOISE: 38nV/

√ Hz at f = 1kHz

q INPUT PROTECTION TO

q WIDE SUPPLY RANGE

Single Supply: 2.7V to 36V

Dual Supply:

q 16-PIN DIP AND SO-16 SOIC PACKAGES

APPLICATIONS

q PRESSURE AND TEMPERATURE BRIDGE

AMPLIFIERS

q INDUSTRIAL PROCESS CONTROL

q FACTORY AUTOMATION

q MULTI-CHANNEL DATA ACQUISITION

q BATTERY OPERATED SYSTEMS

q 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 (250

µV), 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

30k

Ω

10k

Ω

10k

Ω

30k

Ω

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

V

V

V

V

V

V

IN

V+

+

V

IN

–

2

SLEEP

3

V–

V

G = 4 + 60k

Ω

+

–

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