Hi Florian I have not encountered this before. I don't expect it is related to the ADC, but may be due to the relationship between the signal frequency, ADC sample rate and the FFT analysis technique. Can you capture the waveform using a high speed high bandwidth oscilloscope instead of the ADC12J4000 . If that is possible it should also be possible to do similar FFT analysis of the captured data to determine if the phenomena is related to the signal source and analysis technique, or the capturing digitizer. If the signal is created using an arbitrary waveform generator (using a DAC), to change the sample rate of the DAC, while keeping the signal frequency the same. That may also hope point to the nature of the problem. I hope this is helpful. Best regards, Jim B
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