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LMX2592: SPUR and fast calibration

Part Number: LMX2592

Dear Sir,

I am using LMX2592 for 4.3GHz freq generation,   I tried fractional method lot of spurs which is multiple of 50MHz and and multiple of around 22MHz are seen. 
Later I tried Integer method , spur levels got reduced. But still levels are around -72dbm, how can I reduce further Please suggest. And please suggest how to use fast calibration method.

with regards,
Jayasheela
                                 

  • Hi Jayasheela,

    This could be due to high charge pump current, reduce this current should reduce the 50MHz spurs.

    BTW, try not to use the Gain Multiplier whenever possible, datasheet suggest use at most 1.5x.