LMX2592: lmx2592杂散控制

Part Number: LMX2592

hello everyone ,I'm tring to make a clock source with lmx2592 controlled by stm32,

I successful control it with spi interface and got some unexpected wave on my SA. I'm just want to know.

it this wave normal? and how can I reduce the spurious signal

he spectrum picture as below

the span is 5MHZ RBW is 500khz

my confis is as below

best regard!