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ADS8028: Supply Current

Part Number: ADS8028


Good Day.

Power supply DC current need is specified for both AVDD and DVDD together. Could I have them separate? I mean current for AVDD and current for DVDD.
I know it depends on speed and voltage, anyway that 250 mA how is roughly split? 
I am dimensioning the power supply and I need this data to optimize things. With the current information, 250 for the sum, I should have available 300 for digital and 300 for analog, which I dislike.
Best Regards,
Ray Vincent