1. Isn't there problem even if IOVDD turns on the power supply earlier than AVDD?
2. Must it always be started up from 0 V for the power-on reset?
It is not a problem for IOVDD to come up before the AVDD. They can also come up at the same time but I would not have it come up after the AVDD.
For your second question. You must always start up from 0V for the power-on reset. In addition, I suggest you wait a short time to allow the bypass caps on the AVDD and on the DVDD time to discharge. We do not have specifications for this because it is dependent on the user implementation.
Thank you for an answer.
Retrieving data ...