®

PGA202/203

1

Covered by U.S. PATENT #4,883,422

PGA202/203

®

FEATURES

q DIGITALLY PROGRAMMABLE GAINS:

DECADE MODEL—PGA202

GAINS OF 1, 10, 100, 1000

BINARY MODEL—PGA203

GAINS OF 1, 2, 4, 8

q LOW BIAS CURRENT: 50pA max

q FAST SETTLING: 2

q LOW NON-LINEARITY: 0.012% max

q HIGH CMRR: 80dB min

q NEW TRANSCONDUCTANCE CIRCUITRY

q LOW COST

DESCRIPTION

The PGA202 is a monolithic instrumentation ampli-

fier with digitally controlled gains of 1, 10, 100, and

1000. The PGA203 provides gains of 1, 2, 4, and 8.

Both have TTL or CMOS-compatible inputs for easy

microprocessor interface. Both have FET inputs and a

new transconductance circuitry that keeps the band-

width nearly constant with gain. Gain and offsets are

laser trimmed to allow use without any external com-

ponents. Both amplifiers are available in ceramic or

plastic packages. The ceramic package is specified

over the full industrial temperature range while the

plastic package covers the commercial 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

•

Cable: BBRCORP

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Telex: 066-6491

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FAX: (520) 889-1510

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Immediate Product Info: (800) 548-6132

APPLICATIONS

q DATA ACQUISITION SYSTEMS

q AUTO-RANGING CIRCUITS

q DYNAMIC RANGE EXPANSION

q REMOTE INSTRUMENTATION

q TEST EQUIPMENT

Digitally Controlled Programmable-Gain

INSTRUMENTATION AMPLIFIER

Front

End

and

Logic

Circuits

I

1

I

2

8

69

114

11

4

10

12

5

Filter B

–

+

2

Adjust

+V

IN

A

Sense

V

OUT

V

REF

5.3pF*

5.3pF*

30k *

Ω

*±20%

30k *

Ω

V

OS

7

+V

IN

Filter A

PDS-1006C

Printed in U.S.A. August, 1993