RE: AD9514 synchronisation setup and hold times of SYNCB with respect to CLK/CLKB

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Question I would like to use two AD9514 with the same CLK/CLKB clock (it will be phase 
 aligned for both). I will use the SYNCB input of both AD9514 to synchronize all 
 clock outputs. What are the setup and hold times of SYNCB input with respect to 
 CLK/CLKB clock? Answer Sync is asynchronous in nature, i.e it is assumed to be async. I presume that 
 you want to sync two parts and don’t want any ambiguity between the output of 
 those two. I am thinking if you assert sync around 500ps before the clock edge 
 you would get repeatable behavior between the parts. I would use the same 
 number for hold also for repeatability purpose.

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AD9514: FAQ