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OPA197: Input impedance of OPA197

Part Number: OPA197

Hi Amp forum team,

I am an engineer who want to make an analog buffer circuit with OPA197.

In order to identify an input impedance of OPA197, I saw below char on datasheet.

I have two question about above chart.

1. What is the differences between ZID and ZIC? Could you please let me know with circuit example?

2. What is the meaning of "||"? Does it has any relations between input impedance and parasitic capacitance?

Thank you in advance.

Regards,