I'm using the AD9625-2.5-EBZ as my reference design which is set up for AC coupling and a differential input (single ended transformed by a balun).
My end application involves capturing pulses that are not periodic and occur relatively infrequently. I also need to take advantage of the full voltage range of the ADC as my input signal can swing from 0V to +1V. Pulse are in the tens of nanoseconds in length with rise times in the single nanoseconds.
Given the above criteria, it would seem that DC coupling a single ended input is the best path. The AD9625 data sheet indicates that this can be done by tying the negative differential input to Vcm. Is this a reasonable path to pursue? Is there an app note that discusses DC coupling to this ADC in more detail?
Would it also be beneficial to put an op-amp between the input and the ADC?