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LMX2485E boundary spurs

Zheng Li3
Prodigy 10 points
Other Parts Discussed in Thread: LMX2485E

Hi,

I am using LMX2485E in our PLL, the comparison frequency is 2MHz.  The boundary spurs occurs at  +/- 5kHz offset when the VCO operates at 396.005MHz.  The spurs varied with temperature. At room temperature it is about -64dBc. At 0 degree C it increased to -54dBc. Do someone know what cause this? Thanks. Zheng