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?
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
