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XTR117: 4-20ma and 20-4mA output

ahmet dönmezbilek
Prodigy 20 points

Part Number: XTR117
Other Parts Discussed in Thread: XTR116,

Hi,

I’m working on a circuit design that requires two current-loop outputs:

  • Channel 1: Standard 4–20 mA output

  • Channel 2: An inverted 20–4 mA output
    (meaning: when Channel 1 outputs 20 mA, Channel 2 should output 4 mA, and vice-versa)

I have already found several TI reference designs and application notes for generating a standard 4–20 mA output using devices like XTR116 / XTR117.
However, I could not find a clear method or reference for generating the inverted 20–4 mA loop.

My questions:

  1. What is the recommended approach to generate an inverted 20–4 mA output?

  2. Is there any TI reference design, application note, or suggested device for implementing this?

  3. Should the inversion be done by signal conditioning on the voltage side (e.g., mapping 1–5 V → 5–1 V) before feeding the current transmitter IC, or is there a more direct method?

Any guidance or example circuits would be greatly appreciated.

Thank you!