Case: I design a pcb with a microprocessor and a adc (I'll leave out the details).
Is this correct: The digital ground and the analog ground should be connected, but by a small passage.
Next question: If the pcb have hole's for mounting to a metal chassis, should the skrew's then be grounded to the pcb analog/digital ground and to the chassis? Wouldn't that be a better protection?
Or should the analog and digital ground not be connected to the chassis. Instead I should design a "chassis ground" surrounding the digital/analog ground.
Or should the analog/digital just be on the pcb and not connected to the chassis nor should the be any chassis ground either.