The AD9695 has a differential input with a 1.41V common mode voltage and a 1.59Vp-p input range. This means that Vin+ and Vin- may have signal swing of 1.41V +/-0.795Vp-p. May I know what do you mean by small DC signals?
I'm planning to evaluate the AD9695 ADC using the EVAL-AD9695 board. It looks as though I can use either the ADS7-V2EBZ or ADS8-V1EBZ as a motherboard for this. Is there a recommendation on which one to use?