Connecting the output of AD5663 to ADRF6520 will produce Gibbs effect. How to eliminate this effect?

Connecting the output of AD5663 to ADRF6520 will produce Gibbs effect. How to eliminate this effect?
Existing problems:
         When the output change range of AD5663 is large, such as from 0.2V to 1.2V, or 1.2V to 0.2V, the voltage output pin of AD5663 will form an oscillating waveform, the waveform is shown below; but when the AD5663 is configured When the output voltage changes little, the above situation will not occur, or the phenomenon will not be obvious.
The result of this phenomenon is that the digital signal output by the ADC will produce jitter.
         However, this situation only occurs when the AD5663 and ADRF6520 are connected. When the connection between them is disconnected and the output of AD5663 is measured separately, this problem will not occur.

Guess: Is it related to AD5663 load matching? How to solve it?

0v~1.2v1.2v~0v

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