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power requirment of AVCC in AD5516


I am using AD5516. I want to select power ICs for (AVCC DVCC VDD VSS VREF)

I know that noise & ripple on VREF is very important and degrades precision.

Also I know that noise & ripple on VDD & VSS is not important because it has 85 db power supply ripple rejection.  

But my question is about AVCC. Does it need  to be much regulated (as VREF) or it can be fed by a switching power supply?

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