I have AD7732
I wish to turn off the AVDD (+5V) but leave DVDD (+3V3) active so that it does not pull down the SPI bus by intrinsic diodes.
Is this possible?, It not clear on datasheet if this is permitted or not.
AVDD and DVDD are independent of each other. The device will not be damaged if AVDD is turned off while DVDD is still active. When either of the supply is missing, the device is in undefined state - i.e., the on-chip registers will lose their contents.
We're looking into your question and we'll get back to you with an answer.
Any progress Johnny?
Thank, very useful to know state of register so I have to update them after AVDD is switched back on again.
Retrieving data ...