PDS-1312B

Printed in U.S.A. April, 1996

®

Precision, Powered, Three-Port Isolated

INSTRUMENTATION AMPLIFIER

DESCRIPTION

ISO255 is a precision three-port isolated instrumenta-

tion amplifier incorporating a novel duty cycle modu-

lation-demodulation technique and has excellent accu-

racy. Internal input protection can withstand up to

±40V input differential without damage. The signal is

transmitted digitally across a differential capacitive

barrier. With digital modulation the barrier character-

istics do not affect signal integrity. This results in

excellent reliability and good high frequency transient

immunity across the barrier. The DC/DC converter,

amplifier and barrier capacitors are housed in a plastic

DIP.

A power supply range of 11V to 18V makes this

amplifier ideal for a wide range of applications.

ISO255

FEATURES

q RATED

1500Vrms Continuous

2500Vrms for One Minute

100% Tested for Partial Discharge

q GAINS OF 1 TO 10,000

q LOW NONLINEARITY:

q LOW INPUT BIAS CURRENT:

q LOW INPUT OFFSET VOLTAGE

q INPUTS PROTECTED TO

q BIPOLAR OPERATION V

q SYNCHRONIZATION CAPABILITY

q 28-PIN PLASTIC DIP: 0.6" Wide

ISO255

APPLICATIONS

q INDUSTRIAL PROCESS CONTROL

Transducer Isolator, Thermocouple

Isolator, RTD Isolator, Pressure Bridge

Isolator, Flow Meter Isolator

q POWER MONITORING

q MEDICAL INSTRUMENTATION

q ANALYTICAL MEASUREMENTS

q BIOMEDICAL MEASUREMENTS

q DATA ACQUISITION

q TEST EQUIPMENT

q GROUND LOOP ELIMINATION

+V

S1

Com1

–V

IN

+V

IN

–V

S1

GND1

28

26

3

4

27

25

+V

S2

Com2

–V

S2

GND2

12

V

OUT

14

13

11

10

+R

G

1

–R

G

2

ISO255

INA

17

GND3

16

SYNC

15

+V

S3

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