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LMX2595: LMX2595 PLL simulation and measurement results do not match

Part Number: LMX2595


Tool/software:

Hi:

As shown in the figure below, the LMX2595 PLL simulation does not match the measurement results.


The LMX2595 output is used as the sampling clock of the DAC. The DAC outputs a 100MHz sine waveform.

When testing its phase noise, it is found that there is a peak at an offset of 200KHz.

However, according to the PLL software, there is no such peak.

Thanks!