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ADF4355-3 Thermal Issue


I have been having repeatable issue with the ADF4355-3 where heating up the IC will cause unstable RF output. What I'm seeing is the Lock Detect mux output is toggling between '1' and '0' repeatedly. When I update the registers with a new frequency the output will be stable and no other issue seems to reoccur. I know that the VCO output is dependent on temperature and writing to register 10 will update its temperature. Here's a picture of when the issue occurs The frequency I was generating is 370MHz. 

My question is what's the best way to not have the unstable RF output occur once the IC's registers are set? My application requires the IC to not have any instability due to temperature transitions. 

Thank your for your time any advice is greatly appreciated!