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LMX2581 frequency offset

Other Parts Discussed in Thread: LMX2581

Hi,

Does someone else observe frequency offset of 40 kHz while trying to get a wanted signal out of LMX2581?

One example:

Wanted signal: 180 MHz

RFout A+ and RFout B+ used. Doubler: x1. R-counter 5. Phase detector frequency 20 MHz. Phase detector polarity -. Charge Pump Gain 2400microA. Charge Pump State Active. N counter 144. The final divider 16.

Output signal has frequency of 180.04 Mhz.

I observed similar situations on other output signals as well.

Thank you in advance!