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Inconsistent Phase on Startup

Category: Hardware


I am trying to test the RFPLL Phase Sync functionality of the ADRV9009. Right now I am comparing the phase between Tx1 and a signal generator outputting a continuous wave. The phase difference between the two is inconsistent between initializations when the RF PLL is not at an integer multiple of the device clock. I have the RFPLL Phase Sync set to Init and Track Continuously in the Evaluation software, and I believe I am using the most recent version. Any explanation as to why this may be occurring? 


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