Undesirable inharmonious distortions AD6679


For a couple of months I'm testing the AD6679 ADC and there's a problem that can not be solved, maybe you'll help with this:

In the spectrum of the digitized signal there are undesirable inharmonic distortions that depend on the frequency and level of the main signal.For example 170.3 MHz signal: 

and it's analog from the datasheet:

And one more example 340.3 MHz signal:

These distortions are present throughout the spectrum of the signal and are not harmonic. Nothing is written about this in the datasheet. Therefore, I want to know the cause of these distortions and how to get rid of them.

Best regards Petrishchev Sergey.

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