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  • TI Thinks Resolved

LME49721: What's LME49721 input impedance?

Part Number: LME49721

The datasheet says "The input impedance of the op amp is very high" but do we have any numbers?

It doesn't say what kind of input it has, but http://www.ti.com/lit/sg/slot140/slot140.pdf groups it under "Bipolar", so maybe 100 kΩ?

  • Hi Jonathan,

    I think 100kΩ is a good approach for the input impedance. Unfortunately there is no detailed information about this in our information database.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • In reply to Ivan Salazar:

    Well I need >1 MΩ so I guess I can't use this part.

  • In reply to Jonathan9420:

    Jonathan,

    Are you looking for Differential or Common Mode input impedance?
    LME49723 and LME49724 (also from www.ti.com/.../slot140.pdf) show the following specs:
    LME49723:

    LME49724:

    Common Mode input impedance is way higher than Differential input impedance.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

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