I want to make a circuit using the AD1938. I know that my GND is a bit noisy with currents from a bluetooth module. I also know that for audio op-amps it helped greatly to use a regulated 'virtual ground'.
Is it possible to run the AGND and AVDD at a different ground potential than the DGND and DVDD pins? Or are the grounds internally connected?
The grounds are internally connected.
PCB layout will be very important here as is the way you are doing the bypass caps.
Do you mind sharing any of these details?
Thanks Dave! I'm only at the schematic stage right now so not much to share. However I do have some experience integrating these bluetooth receivers with audio gear so I've got a good place to start.
I'll certainly be back here if I need more help!