ad9516

I have two ad9516 evaluation boards, one is ad9516-1, the other is ad9516-5. When I used it, I found that the LD light on the ad9516-1 evaluation board could be normally lit after downloading the same program, but the LD light on ad9516-5 couldn't be lit, and the phase-locked loop was not successfully locked, I don't know what caused it.

I hope I can get your help