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Original question:

ADC3422: how to calculate input voltage vs digital output count

ADC3422: Can negative differential analog input be connected to GND?

Naizeng Wang
Expert 4680 points
Part Number: ADC3422

Hi team,

Can negative differential analog input be connected to GND? Thanks!

Br,

Nison

  • +1
    TI__Guru* 91947 points

    Nison,

    You cannot connect the negative input to GND. The ADC output will have no meaning. 

    To get the performance mentioned in the datasheet, both INP and INM should see a proper common mode voltage (VCM, 0.95V typically). 

    It is recommended to bias INP and INM each around required common mode voltage which is VCM (typically 0.95V) +/- 0.025V.

    Regards,

    Jim