If the SYNC pin is not used, is it recommended to connect to GND? Or is it NC?
The SYNC input is active high so if not used it is advisable to connect this pin to ground to prevent an inadvertent signal strobing this line. Also, you can disable the SYNC function within the AD9258 by setting bit 0 of register 0x100 to a value of '0.'
Thank you for your answer.
I see your answer.
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