I like to add an analog switch in-front of the PVDDx in order to support a HW safety mechanism (meaning, shutdown IDACs current by turning PVDDx off)
Is it ok to shutdown PVDDx while other power rails are on?
It is definitely acceptable to switch off PVDD in a fault situation. The ADuCM320 will not be damaged. Doing this though will slightly change the loading on the internal regulators which could slightly affect the accuracy of the other analog peripherals. Therefore the recommendation is after switching off PVDD to change the IDAC outputs to zero then re-enable PVDD and to ignore any analog measurements done during the time PVDD was off.
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