PDS-627G

Printed in U.S.A. October, 1993

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

XTR101

Precision, Low Drift

4-20mA TWO-WIRE TRANSMITTER

FEATURES

q INSTRUMENTATION AMPLIFIER INPUT

Low Offset Voltage, 30

Low Voltage Drift, 0.75

Low Nonlinearity, 0.01% max

q TRUE TWO-WIRE OPERATION

Power and Signal on One Wire Pair

Current Mode Signal Transmission

High Noise Immunity

q DUAL MATCHED CURRENT SOURCES

q WIDE SUPPLY RANGE: 11.6V to 40V

q –40

q SMALL 14-PIN DIP PACKAGE, CERAMIC

AND PLASTIC

APPLICATIONS

q INDUSTRIAL PROCESS CONTROL

Pressure Transmitters

Temperature Transmitters

Millivolt Transmitters

q RESISTANCE BRIDGE INPUTS

q THERMOCOUPLE INPUTS

q RTD INPUTS

q CURRENT SHUNT (mV) INPUTS

q PRECISION DUAL CURRENT SOURCES

q AUTOMATED MANUFACTURING

q POWER/PLANT ENERGY SYSTEM

MONITORING

DESCRIPTION

The XTR101 is a microcircuit, 4-20mA, two-wire

transmitter containing a high accuracy instrumenta-

tion amplifier (IA), a voltage-controlled output current

source, and dual-matched precision current reference.

This combination is ideally suited for remote signal

conditioning of a wide variety of transducers such as

thermocouples, RTDs, thermistors, and strain gauge

bridges. State-of-the-art design and laser-trimming,

wide temperature range operation and small size make

it very suitable for industrial process control applica-

tions. In addition, the optional external transistor al-

lows even higher precision.

The two-wire transmitter allows signal and power to

be supplied on a single wire-pair by modulating the

power supply current with the input signal source. The

transmitter is immune to voltage drops from long runs

and noise from motors, relays, actuators, switches,

transformers, and industrial equipment. It can be used

by OEMs producing transmitter modules or by data

acquisition system manufacturers.

2

B

14

9

1

8

11

10

3

5

6

4

XTR101

e

1

12

Optional

Offset Null

Optional

External

Transistor

REF1

I

REF2

I

I

OUT

7

13

E

(1)

(1)

e

2

Span

NOTE: (1) Pins 12 and 13 are used for optional BW control.

+

–

+V

CC

®