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AD9371 PLL does not lock

Category: Hardware
Product Number: AD9371
Software Version: MyKonos no os

I am using AD9528 with AD9371. My SPI of both are working fine.

AD9528 is locking its PLL but AD9371 PLL is not locking. I have checked the DEVICE Clock on AD9371 Pins. They are present. Is SYSREF mandatory for PLL locking?