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AM3352: What is ADC Internal impedance value?

Daniel Cheng1
Mastermind 7075 points
Part Number: AM3352

Hi Expert,

What is ADC Internal impedance value?

I can not find out the data from datasheet.

How do I to get the value?

Thanks

Daniel

  • 0
    TI__Guru 62855 points

    Are you asking for input impedance looking into one of the AIN pins of the ADC?  If so, that is defined in the datasheet.

    Input impedance of AIN[7:0], when ƒ = frequency of applied signal: [1 / ((65.97 × 10E–12) × ƒ)] Ω.

    This defines the dynamic input impedance. 

    The input could also have about 1uA of leakage current as the applied voltage approaches VDDA_ADC or VSS_ADC, where the AIN pin sources current when the voltage applied is less than mid-supply and the AIN pin sinks current when the voltage applied is greater than mid-supply.

    Regards,
    Paul