Hi Team,
Good day! We wanted to clarify the input impedance in INA132. We need a clarification on the datasheet value of input impedance of INA132. The datasheet shows common mode and diff mode as 80k ohm whereas we understand Common-mode impedance should be 40k. Kindly please clarify.
Best regards,
Jonathan
Hi Jonathan,
We wanted to clarify the input impedance in INA132
The noninverting and inverting effective input impedance nodes in a difference amplifier are not exactly equal. For the non-inverting input impedance node in common mode(CM), the Rin+ is equal to R3 + R4 or 80kΩ . At the inverting node, the effective input impedance in CM is approx. Rin- = 26.67kΩ (defined as Rin- = Vin-/Iin-), see the explanation in the link below.
If you have additional questions, please let us know.
Best,
Raymond
