Other Parts Discussed in Thread: USB2ANY, LMX2592EVM
I'm running an LMX2582EVM around 5.2 GHz and seeing a 4.2 MHz spur on all channels despite the charge pump setting, external power supplies, even if the Num/Div dividers are set to an integer channel, disconnecting the USB2ANY the spur is there. The modified loop filter components are a passive second order with C1=3.3nF, C2=100nF, R2=680ohms. I can send the register dump in an email about this setup. Anyone have any other ideas what is causing this or seen this spur?