What is the impact of REF CLK source jitter on the DDS output?
Yes, it will impact the DDS output. The DDS is basically a high resolution divider. If the input (REF CLK source) to a divider has jitter it will transfer to the output. So, the REF CLK source performance is critical to the overall performance.
Note, if the internal REF CLK multiplier (PLL) in the DDS is enabled, it could help filter noise outside the loop bandwidth of the PLL. However, it gains up the noise within the loop bandwidth of the
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