I am designing a PCB for reading analog signal by the AD7732. I searched a lot to find tips which increase the precision and effective bit resolution. One of these tips is to segregate analog power supply and the Digital one due to switching noise of digital components. I want to Know:
How to design a suitable powering circuits for an ADC. In AD7732 datasheet I did't see any new and different point exclusive for an ADC. It is worth collecting some tips around.
Should I connect analog ground to digital ground? In some datasheets I read they should be connected. If this is true why do we segregate analog and digital power supplies? Doesn't this connection pass noise from one side to other side?
Is two switching power supplies proper to use as analog and digital power supplies?