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[FAQ] Does TI have integrated 4-20mA transmitters for inputs from RTDs?

Other Parts Discussed in Thread: XTR105, XTR112, XTR108

Does TI have integrated 4-20mA transmitters for inputs from RTDs (resistive temperature detectors)?

  • Yes. When using an RTD, take care that your input signal is properly conditioned. See the attached articles to learn how to use an amplifier with optimized positive feedback to correct for the decrease in RTD sensitivity over temperature. The listed XTR devices include all of the excitation, linearization, and amplification for an RTD input.

    Signal Conditioning and Linearization of RTD Sensors

    Analog Linearization of RTDs

    TI devices: XTR105, XTR108, XTR112

    The following reference designs go through the theory, component selection, simulation, complete PCB schematic & layout, bill of materials, and measured performance results of a 2-wire (loop-powered) 4-20mA sensor transmitter interfacing with 3-wire RTD. Circuit modifications that help to meet alternate design goals are also discussed.

    TIPD161 (XTR105), TIPD202 (XTR112)