I have generated the required clocks using two different configurations of the AD9516-1. One mode uses VCO, divides by 2, and thus I need a higher input clock frequency. The other mode bypasses VCO, and thus I can use a lower input clock frequency.
Is there an obvious advantage to using one versus the other (phase noise effects) ? Should I always use the VCO when possible, or always bypass the VCO when possible? Or should I just try both and see which gives the best results?