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OPA928: Imput impedance

Part Number: OPA928

Hi,

Let me ask you a very basic question.

I do not understand well the meaning of the difference between "differential impedance ZID" and "Common impedance ZIC".

Will you tell me meaning of the difference and show me the sample circuit which shows the difference, if possible?

Because there is a large difference value between ZID(100M ohm) and ZIC(10T ohm). 

Sorry for my poor understandong.

Thanks for your support.

Best Regards,

Takumi