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SM320F28335-HT: ADC external biasing components

Brandon Dyer1
Intellectual 500 points
Part Number: SM320F28335-HT

Hello,

I have a question regarding the 2.2uF caps that the data sheet says to add on the ADCREFx pins.  What effect would using a 1uF cap on these pins have on the ADC readings/functionality, specifically when operating at 200°C.  

Thanks,

Brandon

  • 0
    TI__Guru 62975 points

    Brandon,

    The capacitors are relied upon to filter out voltage reference noise so I would expect that a smaller cap value might degrade the ADC accuracy to a certain extent. We don't have a practical way of modeling the exact effects. This tendency to degrade would apply at any operating temperature. I would not expect the ADC control logic / state machine to be affected.

    -Tommy