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 reference), instrumentation amplifier, sensor linearization, and current output circuitry. Current for powering additional external input circuitry is available from the VREG pin.
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 complete current transmitter, including the linearized bridge, is low enough to permit use without adjustment in many applications. The XTR106 operates on loop power supply 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.
LOW TOTAL UNADJUSTED ERROR
2.5V, 5V BRIDGE EXCITATION REFERENCE
5.1V REGULATOR OUTPUT
LOW SPAN DRIFT: ±25ppm/°C max
LOW OFFSET DRIFT: 0.25µV/°C
HIGH PSR: 110dB min
HIGH CMR: 86dB min
WIDE SUPPLY RANGE: 7.5V to 36V
14-PIN DIP AND SO-14 SURFACE-MOUNT
APPLICATIONS
PRESSURE BRIDGE TRANSMITTERS
STRAIN GAGE TRANSMITTERS
TEMPERATURE BRIDGE TRANSMITTERS
INDUSTRIAL PROCESS CONTROL
SCADA REMOTE DATA ACQUISITION
REMOTE TRANSDUCERS
WEIGHING SYSTEMS
ACCELEROMETERS
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