which is time needed to have the AD9635 up and running after power supply has been applied?
I'm not sure I can consider the value indicated for the "Wake-Up Time (Power-Down)" stated in the datasheet.
Yes, you are correct. The 375us wake-up time from power down is the time to wake-up from the power-down mode, and not from initially bringing up the power supplies.
When first powered up (and…