AD9683 SYNCINB inputs setup/hold time are not specified in datasheet. Are they not needed for operation in subclass0?
SYNCINB signal is a level triggered signal deasserted from the receiver or logic device. There should not be any timing issues. No requirement for setup/hold time on SYNCB inputs. There is an internal timing between the SYNCINB and LMFC. The initialization routine is shown below:
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