XTR106UA/2K5 Integrated Circuits (ICs)

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1. DESCRIPTION

The XTR106UA/2K5 is a low cost, monolithic 4-20mA, twowire 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 XTR106UA/2K5 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 XTR106UA/2K5 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.

2. FEATURES

    1. LOW TOTAL UNADJUSTED ERROR

    2. 2.5V, 5V BRIDGE EXCITATION REFERENCE

    3. 5.1V REGULATOR OUTPUT

    4. LOW SPAN DRIFT: ±25ppm/°C max

    5. LOW OFFSET DRIFT: 0.25µV/°C

    6. HIGH PSR: 110dB min

    7. HIGH CMR: 86dB min

    8. WIDE SUPPLY RANGE: 7.5V to 36V

    9. 14-PIN DIP AND SO-14 SURFACE-MOUNT

3. APPLICATIONS

    1. PRESSURE BRIDGE TRANSMITTERS

    2. STRAIN GAGE TRANSMITTERS

    3. TEMPERATURE BRIDGE TRANSMITTERS

    4. INDUSTRIAL PROCESS CONTROL

    5. SCADA REMOTE DATA ACQUISITION

    6. REMOTE TRANSDUCERS

    7. WEIGHING SYSTEMS

    8. ACCELEROMETERS