I just took over an amplifying circuit board on which the last stage is a buffer circuit with ADA4177-2 for two signals. My problem is, there always exists a difference of 0.07V between the buffer input and output. My current input signal is around 1.1V~1.5V. The power supply is V+ = 2.5V and V- = -0.2V, not symmetrical. I am wondering if this is the reason for the deviation?
Many thanks in advance!
I'm surprised it is doing anything.
-- You need at least 5V across the part to wake it up
-- It is not RR input; you need to stay at least 1.5V away from either rail.
Try an ADA4084-2 or an ADA4528-2
For the LMC662,, you could also look at:
ADA4691-2, ADA4666-2, AD8607, AD8617, or ADA4692-2