I have following questions on AD8022.
a) Datasheet shows, INPUT CHARACTERISTICS, Input Resistance (Differential) is 20kΩ, as Typical.
Could you please confirm whether this value 20k is really correct or not ?
It may sound strangely, but normally we can see Mega ohm level definition, so 20k seems a bit low, we feel.
b) Could you please give common mode(not differential) impedance value of AD8022 ?
or calculating formula if there is.
c) If value 20k ohm is correct in above a), do you think AD8022 is not well suit for voltage-follower with unity-gain,
which is normally requiring higher impedance ?
Sorry for these fundamental questions, but your support and helps would be very much appreciated.