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LMX2594: Need help understanding LMX2594 spurs

Part Number: LMX2594
Other Parts Discussed in Thread: , LMK04828, USB2ANY

I'm using the LMX2594EVM along with the 100MHz ref clk from the Reference Pro board.  I'm operating in integer mode and seeing spurs fairly close to my fundamental.  What's the cause of these?  In particular, what is causing the large spurs on either side of the 5GHz output (+/-2MHz from 5GHz) and is there anything I can do to reduce them?