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ADS8330: Best way to power +VA?

Part Number: ADS8330

I'm curious what the exact purpose of +VA is, like, what is it powering? 

Does it need to be a low ripple source? 
If yes, can I just power it from my voltage reference or is that a stupid thing to do? 

The voltage reference I'm using is the REF5040AIDR which is rated for 10mA output. This ADC is the only thing using that ref.