Just for comparison, take an look on those two screen shots of AD9850 module:
As you can see, sinusoidal signal is not perfect, you can obviously see quantization steps in time, and just imagine how some digital logic will work with such distorted signal at input!
Only solution for this is to go on with very high speed DDS (very expensive) clocked at >1GHz (AD9850 is clocked at 125MHz).
What are you developing?
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