1

®

INA146

®

INA146

PDS-1491A

Printed in U.S.A. September, 1999

High-Voltage, Programmable Gain

DIFFERENCE AMPLIFIER

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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

For most current data sheet and other product

information, visit www.burr-brown.com

INA146

DESCRIPTION

The INA146 is a precision difference amplifier that

can be used to accurately attenuate high differential

voltages and reject high common-mode voltages for

compatibility with common signal processing voltage

levels. High-voltage capability also affords inherent

input protection. The input common-mode range ex-

tends beyond both supply rails, making the INA146

well-suited for both single and dual supply applica-

tions.

On-chip precision resistors are laser-trimmed to achieve

accurate gain and high common-mode rejection. Ex-

cellent TCR tracking of these resistors assures contin-

ued high precision over temperature.

A 10:1 difference amplifier provides 0.1V/V gain

when the output amplifier is used as a unity-gain

buffer. In this configuration, input voltages up to

±100V can be measured. Gains greater than 0.1V/V

can be set with an external resistor pair without affect-

ing the common-mode input range.

The INA146 is available in the SO-8 surface-mount

package specified for the extended industrial tempera-

ture range, –40

°C to +85°C.

FEATURES

q HIGH COMMON-MODE VOLTAGE:

q DIFFERENTIAL GAIN = 0.1V/V TO 100V/V:

Set with External Resistors

q LOW QUIESCENT CURRENT: 570

q WIDE SUPPLY RANGE:

Single Supply: 4.5V to 36V

Dual Supplies:

q LOW GAIN ERROR: 0.025%

q HIGH CMR: 80dB

q SO-8 PACKAGE

APPLICATIONS

q CURRENT SHUNT MEASUREMENTS

q SENSOR AMPLIFIER

q SYNCHRONOUS DEMODULATOR

q CURRENT AND DIFFERENTIAL LINE

RECEIVER

q VOLTAGE-CONTROLLED CURRENT

SOURCE

q BATTERY POWERED SYSTEMS

q LOW COST AUTOMOTIVE

INSTRUMENTATION

R

5

10k

Ω

(1%)

A1

V

IN

INA146

V

O

R

2

10k

Ω

R

1

100k

Ω

V

IN

R

3

100k

Ω

R

4

10k

Ω

R

G1

R

G2

A2

V

01

Ref

V–

V+

G = 0.1

+

–

2

5

7

41

8

6

3

V

+–

SBOS109