Is it possible for there to be a meta-stability issue if the I/O UPDATE signal is not synchronized external to the AD9951?
If so, how would it manifest this issue with respect to the AD9951 operation.
The combination of SYNC_CLK and I/O UPDATE pins provides the user with constant latency relative to SYSCLK, also, it ensures the phase continuity of the analog output signal once there is a change in tuning word or phase offset value.
Thus, if I/O UPDATE is not synchronized with SYNC_CLK, you can not ensure that the data is fully transferred from buffer to register banks. Also, there will be inconsistent latency of analog output with respect to SYSCLK.
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