about AD9554 synchronization


Can AD9554 output four Channel synchronous differential clocks from one reference clock input (65MHz oscillator connected to REFA)?

my purpose is to generate four same clean and low jitter clocks from the same source clock input.

the Schematic is as below:

please comment.


  • Hi Victory,

    Yes, this is possible. One would use the “Soft sync all” bit to accomplish this.

    This will synchronize the output dividers of all channels to within a VCO clock cycle. All channels need to be locked to the same reference frequency to ensure the outputs stay synchronized. It should also be noted that for the best quality synchronization, the soft sync all operation should be executed only after the DPLLs of all channels are phase locked.

    Best regards