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PDS-1449A

Printed in U.S.A. June, 1998

XTR106

4-20mA CURRENT TRANSMITTER

with Bridge Excitation and Linearization

®

FEATURES

q LOW TOTAL UNADJUSTED ERROR

q 2.5V, 5V BRIDGE EXCITATION REFERENCE

q 5.1V REGULATOR OUTPUT

q LOW SPAN DRIFT:

q LOW OFFSET DRIFT: 0.25

q HIGH PSR: 110dB min

q HIGH CMR: 86dB min

q WIDE SUPPLY RANGE: 7.5V to 36V

q 14-PIN DIP AND SO-14 SURFACE-MOUNT

APPLICATIONS

q PRESSURE BRIDGE TRANSMITTER

q STRAIN GAGE TRANSMITTER

q TEMPERATURE BRIDGE TRANSMITTER

q INDUSTRIAL PROCESS CONTROL

q SCADA REMOTE DATA ACQUISITION

q REMOTE TRANSDUCERS

q WEIGHING SYSTEMS

q ACCELEROMETERS

DESCRIPTION

The XTR106 is a low cost, monolithic 4-20mA, two-

wire current transmitter designed for bridge sensors. It

provides complete bridge excitation (2.5V or 5V refer-

ence), instrumentation amplifier, sensor linearization,

and current output circuitry. Current for powering ad-

ditional external input circuitry is available from the

The instrumentation amplifier can be used over a wide

range of gain, accommodating a variety of input signal

types and sensors. Total unadjusted error of the com-

plete current transmitter, including the linearized bridge,

is low enough to permit use without adjustment in many

applications. The XTR106 operates on loop power sup-

ply voltages down to 7.5V.

Linearization circuitry provides second-order correction

to the transfer function by controlling bridge excitation

voltage. It provides up to a 20:1 improvement in

nonlinearity, even with low cost transducers.

The XTR106 is available in 14-pin plastic DIP and

SO-14 surface-mount packages and is specified for the

–40

°C to +85°C temperature range. Operation is from

–55

°C to +125°C.

XTR106

XTR106

XTR106

–

R

L

I

OUT

I

RET

V

O

4-20mA

V

PS

+

7.5V to 36V

V

V

5V

R

LIN

Lin

Polarity

V

R

G

BRIDGE NONLINEARITY CORRECTION

USING XTR106

0mV

Bridge Output

10mV

2.0

1.5

1.0

0.5

0

–0.5

Uncorrected

Bridge Output

Corrected

5mV