Adc giving widely flactuating values

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  1. - 16th December 2006, 17:00 #6
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    sougata
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    Default What about your power supply?

    Hi,

    If you are using your VDD as Vref for the ADC then it is important that your power supply is clean and steady. Because that effects your overall conversion accuracy. General remedies are decoupling caps on the VDD-VSS pins of your PIC and a stable source.

    As steve mentioned there could be noise from the op-amps output too. So decouplers for them as well.
    Last edited by sougata; - 16th December 2006 at 17:02.
    Regards

    Sougata
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