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The XTR105 is a monolithic 4-20mA, two-wire current transmitter with two precision current sources. It provides complete current excitation for Platinum RTD temperature sensors and bridges, instrumentation amplifier, and current output circuitry on a single integrated circuit.
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 in many applications. This includes zero output current drift, span drift and nonlinearity. The XTR105 operates on loop power supply voltages down to 7.5V. The XTR105 is available in 14-pin plastic DIP and SO-14 surface-mount packages and is specified for the 40°C to +85°C industrial temperature range.
XTR105 Maximum Ratings
Power Supply, V+ (referenced to IO pin) ......................................... 40V Input Voltage, V+IN, V-IN (referenced to IO pin) ........................ 0V to V+ Storage Temperature Range ........................................ 55 to +125 Lead Temperature (soldering, 10s) .............................................. +300 Output Current Limit .............................................................. Continuous Junction Temperature ................................................................... +165
NOTE: (1) Stresses above these ratings may cause permanent damage.
XTR105 Features
`LOW UNADJUSTED ERROR `TWO PRECISION CURRENT SOURCES 800A EACH `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 `14-PIN DIP AND SO-14 SOIC PACKAGES
XTR105 Typical Application
·INDUSTRIAL PROCESS CONTROL ·FACTORY AUTOMATION ·SCADA REMOTE DATA ACQUISITION ·REMOTE TEMPERATURE AND PRESSURE TRANSDUCERS