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INA213: The differential and common-mode input impedance of INA213

Jack Li-SH
Expert 3195 points
Part Number: INA213

Dear sir,

Can you help comment on the differential and common-mode input impedance of INA213BIDCKR?

Thanks for your great support here!

Regards,

Jack

  • +1
    TI__Mastermind 27590 points

    Hi Jack,

    Here is a simplified block diagram to illustrate relevant resistors for this topic.

    The common mode input impedance looking into either input pin equals to R1+R2; the differential input impedance is effectively Rdiff, a resistor between the two input pins.

    The datasheet discusses common mode impedance, its value can be inferred from the slopes of either of these two curves:

    The differential impedance was not spelled out in the datasheet, but it is about 2.5KOhm.

    Regards, Guang