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ADS8634 input impedance

robinfeng
Intellectual 960 points
Other Parts Discussed in Thread: ADS8634

Dear expert:

    my customer want to know the ADS8634 input impedance, it's not avilable on datasheet, could you help to provide it. Thanks.

regards

Robin

  • 0
    TI__Expert 4405 points

    Robin,

    The ADS8634 has a direct capacitor load at its sampling input. The input impedance is dependent on the sampling rate and can be calculated as 1/(cf).

    The total input capacitance is listed as 8pf on the datasheet, out of which the switching capacitor is 5pf.

    So at 1Msps throughput, the approximate input impedance would be 200K.

    Regards,

    Sandeep