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instrumentation amplifier single supply

Discussion in 'General Electronics Discussion' started by CatCat, Jan 27, 2017.

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  1. CatCat


    Sep 23, 2016

    So, I got this:

    Obviously, it’s built around ina-333 which, according to the docs, can be used with a single-supply.
    The module has Vref Vcc 3.3V and GND (
    What is the right way to power it?????????

    I have an idea what to do with 3.3 and GND, what should I do with Vref and Vcc??

    Can I use a voltage divider for the Ref to begin with?? Here ( they say no but I’m not sure why……. And the suggested solution is too complicated to me.
    Like I thought I don’t need any complex circuits because this is “a ready to use” module. Stupid me……

    I do need it to work with negative and positive input voltages. Does it mean I cannot follow Figure 11 (page 10) from this doc:

    ught,… how to wire this thing???
  2. CatCat


    Sep 23, 2016
    9905_2_2858.jpg 9905_4_9729.jpg
  3. davenn

    davenn Moderator

    Sep 5, 2009
    that chip is designed for a split rail supply
    but considering you haven't posted any info on what else that board is doing, it's kind of difficult to give advice
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