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ADS8319: What is the absolute maximum of VREFIN pin?

Part Number: ADS8319


Hello guys,

One of my customers is evaluating ADS8319 for their new products.
At this moment, they have the following questions  Could you please give me your reply?

Q1. What is the absolute maximum of VREFIN pin? 

Q2. In their circuit, ADS8319 VREFIN voltage is powered up a little bit earlier than +VA powered up timing.
       Does this occur any problem? Is the device damaged? 

Your reply would be much appreciated.

Best regards,
Kazuya.