>  The maximum value of Vref+ is stated as AVdd + 0.3, but I'm not sure
> what "AVdd" is.  What is meaning of the "A" in AVdd?

The "A" probably stands for Analogue. There was a note from someone on this
list in the past that if you buy the chips as die to put in your own package
then the ADC portion of the chip has its own power pad, which is separately
bonded to the Vdd pins inside the packaged chips we purchase.

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