Hi Muruga, Did you have additional questions regarding the AVDD voltage? I provided some guidance in a previous post (see: e2e.ti.com/.../751792) , but perhaps I should have clarified that running AVDD at 3.3V is not recommended as it is outside of the datasheet specifications. Do you know what the typical input voltage are on each channel? Perhaps there is some relationship with the reduced AVDD voltage, but it is also possible that when switching channels the PGA inputs could be over-ranged (causing the PGA outputs to saturate) and drawing additional current. It might be a good practice to program the ADCON register (to reduce the PGA gain) first, and then update the MUX register when switching channels to avoid this possibility.
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