FEATURES

LOW UNADJUSTED ERROR

PRECISION CURRENT SOURCES

XTR112: Two 250mA

XTR114: Two 100mA

RTD OR BRIDGE EXCITATION

LINEARIZATION

TWO OR THREE-WIRE RTD OPERATION

LOW OFFSET DRIFT: 0.4mV/°C

LOW OUTPUT CURRENT NOISE: 30nAp-p

HIGH PSR: 110dB min

HIGH CMR: 86dB min

WIDE SUPPLY RANGE: 7.5V TO 36V

SO-14 SOIC PACKAGE

APPLICATIONS

INDUSTRIAL PROCESS CONTROL

FACTORY AUTOMATION

SCADA REMOTE DATA ACQUISITION

REMOTE TEMPERATURE AND PRESSURE

TRANSDUCERS

DESCRIPTION

The XTR112 and XTR114 are monolithic 4-20mA,

two-wire current transmitters. They provide complete

current excitation for high impedance platinum RTD

temperature sensors and bridges, instrumentation amplifier,

and current output circuitry on a single integrated

circuit. The XTR112 has two 250mA current

sources while the XTR114 has two 100mA sources for

RTD excitation.

Versatile linearization circuitry provides a 2nd-order

correction to the RTD, typically achieving a 40:1

improvement in linearity.

Instrumentation amplifier gain can be configured for a

wide range of temperature or pressure measurements.

Total unadjusted error of the complete current transmitter

is low enough to permit use without adjustment

many applications. This includes zero output current

drift, span drift and nonlinearity. The XTR112

and XTR114 operate on loop power supply voltages

down to 7.5V.

Both are available in an SO-14 surface-mount package

and are specified for the –40°C to +85°C industrial

temperature range.