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AD9979 and spread spectrum crystal oscillator

My customer is considering combining the AD9979 with a spread spectrum crystal oscillator.
Spread Spectrum Crystal Oscillators are programmable.
Customers are looking for a suitable setting for the AD9979.

1) If you have any concerns or problems in using spread spectrum, we would appreciate your guidance.
Customers are concerned that when the spreading factor or modulation rate is too high, it affects sampling timing and vertical lines appear on the screen.

2) Do you have data on the modulation tolerance of the clock input?
I will be grateful if you tell.

Best regards

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