Hi again Doug,
I investigated the the evaluation boards of these chips. In the schematic of the evaluation board of AD9643 (for ex.http://www.analog.com/static/imported-files/user_guides/UG-293.pdf page:16) there is Ain analog input. The differential signal is generated from the analog input. The other ADC chips' evaluation boards have similar schematics.
What is the absolute maximum voltage levels for the Ain (Analog input)? I guess It can oscillate between negative and positive voltages(for ex. between -1V +1V).
What is generated by the transformer circuitry by using Ain? What is the Vin-A and Vin+A voltage levels?
Thanks,
Muhammet