RE: Digital and analog ground
Thank you for reply
Again, I want to ask one query that, I just have seen about +Ve and –Ve external reference voltage for ADC.
ADCON1 register of 16f883 has two bits VCFG0 and VCFG1, by setting these two bits, I can connect +/- voltage references to +Vref and –Vref pins.
So now if I use 5v as a +vref, which is derived from +15V (using zener)
and analog gnd i.e. gnd of +15v as a –Vref
Then will it help to get the galvanic isolation?
If not then plz suggest me, how I can isolate PIC ADC from analog circuitry ?