As I understand, to sync multi AD9914, it has to run at 2.5 GHz. What sync/clock module (AD951x series, AD952x series etc ) would you recommend clocking at 2.5 GHz?
Can this setup be realised by the available eval boards?
The AD9513, AD9515 and AD9525 were used for synchronizing multiple AD9915 as discussed in this application note. The evaluation boards for these parts are commercially available.