I am trying to use AD9548 sync with 1pps GPS signal.
My original plan should be use OXCO as system clock.
But for fast checking, I just use the XTAL 50Mhz on evaluation kit first.
I connected the 1pps signal go into the reference B(single-end), but the DPLL just keep at Free-Run mode.
The 1pps signal is : 0-3.3Vp-p, pulse width 10m sec - 100m sec.
I see other guys that it also difficult to lock while use TXCO.
Is it I only can apply the 1pps signal with OXCO?
I also upload the profile for your reference. Any parameter that I need to concern.