QHave you got a macro model for AD8622 for +/-2.5V supply voltage operation?
For Vs=+/-5V it works fine but it doesn’t work with +/-2.5V.
AOur SPICE models are usually created for the higher supply voltage of the op
amp (mentioned in the header file); in the case of AD8622, it is +/-15V.
A good way to test out the model would be to use it at the higher supply mode.