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Synchronizing phase of multiple AD9914

I have seen several posts about synchronizing multiple AD9915's but not much on the AD9914.  I want to synchronize the phase of multiple AD9914 chips in a system but need to operate with a 3.5 GHz REF CLK.  Some posts indicate synchronization isn't possible/practical with a REF CLK greater than 2.5 GHz but it wasn't clear if that was only applicable to the AD9915.  Can multiple AD9914's with a 3.5 GHz REF CLK be synchronized ?

  • The AD9914 does not support multi-chip synchronization. Note the absence of the SYNC_OUT control bits (CFR2[9:8]) in the AD9914 data sheet versus the AD9915.

    One period of a 3.5GHz system clock is less than 300ps, making multi-chip synchronization a very challenging task, indeed, for the AD9914. Hence, the lack of such functionality.