We use AD9528 for a new desgin , in oder to get 2500Base-TX clock, so VCXO we use the 25MHz ,
and use the follow config which as 3.stp show to write registers, but PLL2 can not lock,
At before , we have been desgined another system also use AD9528 , use 30.72MHz Crystal , this board can locked and work well.
If replace 25MHz to 30.72MHz Crystal , and use registers configure, PLL2 locked.
Who can tell me what is the problem with the 25MHz desgin ?