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AD9528 PLL2 can not lock

Question asked by cangcanglang on Aug 3, 2017
Latest reply on Aug 3, 2017 by SteveO

Hello 

 

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 ?

 

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