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TMS320F28075: ADCINA1 internal 50KOHM pulldown resistor question

Huihuang Chen
Expert 4000 points
Part Number: TMS320F28075

Hi Champ,

The ADCINA1 has internal 50KOHM pulldown resistor, may I know how this resistor will affect the ADC result?

Anything need to take care will using this channel to sampling the signal?

  • 0
    TI__Guru 60865 points

    Hi Huihuang,

    If you have an ADC input driver with a high resistance (e.g. a voltage divider from a high voltage with no op-amp buffer) then the pull-down will form a voltage divider with the input, causing some gain error in the result.

    If you drive the input with an op-amp, the error effect will generally be very small or negligible.