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The AD9747 output square wave signal contains even harmonics

Category: Hardware
Product Number: AD9747 , AD974

The square wave signal should be a combination of countless odd harmonics, but the AD9747 will produce even harmonics when the frequency of the square wave is too high.

Below are the time domain and frequency domain diagrams of 5MHz square wave signals.

10MHz.

The oscilloscope observed obvious waveform distortion, and the clutter amplitude in the signal was high, which seriously affected the waveform quality.

May I ask, what is the cause of this situation?

What are the solutions?

Can this situation be improved by optimizing the register configuration of the AD9747? How to configure?