Hello,
Is not possible to achieve what you mentioned. VDD1, VDD2, VDD3, VDD4, and VDDA must be shorted to a common source on PCB. And VREFH should always be equal to or less than VDDA + 0.1 V and VDD + 0.1 V.
So, all VDDx voltages should be equal and if VDDx is 3.3V, VREFH must not exceed 3.4V.
Have a great day,
TIC
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