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

Katlynne Jones
Mastermind 25343 points
Other Parts Discussed in Thread: XTR106, PGA309, XTR117

Does TI have integrated 4-20mA transmitters for inputs from bridge sensors?

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    TI__Mastermind 25343 points

    Yes. When using a bridge sensor, 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 nonlinearities in your sensor. TI's XTR106 includes 2.5V and 5V excitation sources, linearization, and amplification for a bridge sensor input.

    Signal Conditioning and Linearization of RTD Sensors

    Analog Linearization of RTDs

    TI devices: XTR106, PGA309 with XTR117

    The following reference design goes 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 (XTR117), and PGA309 providing linearization and temperature compensation to a differential bridge sensor voltage. Circuit modifications that help to meet alternate design goals are also discussed.

    TIPD126

    Figure 1 in the XTR106 datasheet + the Applications Information section on page 9 is also a good design reference.

    XTR106 Datasheet: Figure1