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Why Op AD829 only offer differential input impedance?

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thanks
but which type op offer differencial input impedance? and which other type op offer common mode input impedance?
 

alphi said:
thanks
but which type op offer differencial input impedance? and which other type op offer common mode input impedance?
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MOSFET and JFET input op amps have virtually infinite differential and common mode input resistance (capacitance should be specified in datasheet). Bipolar input op amps should at least spec differential input resistance, but apparently not all do.
Common mode rejection should be spec'ed in all op amps, but I don't know if it is.
 

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