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PLL not locking

Category: Hardware
Product Number: AD9901

I'm working with a 10KHz reference signal from a GPS, and and 10MHz OCXO divided by 1000.

When the AD9901 gets to the exact locking state, it suddenly unlocks and starts over.

I'm using a linear power supply, the whole circuit is highly filtered. What could be wrong?

Thanks in advace.

PAB.