Which is ABSOLUTE MAXIMUM RATINGS, 4.3 V p-p or 4.6V p-p differential ?
In the datasheet @ AD9690,
"ABSOLUTE MAXIMUM RATINGS
VIN± to AGND 3.2 V"
I understand it means 4.6 V p-p differential at VCM=2.05V.
"Absolute Maximum Input Swing
The absolute maximum input swing allowed at the inputs of theAD9690 is 4.3 V p-p differential.
Signals operating near or at this level can cause permanent damage to the ADC."