Audio and digital groundd

[DaQue]

The board/chip I am using will both receive from and output to the audio adapter. The board has separate grounds for audio and digital separated by ferrite beads. Should I run a separate isolated ground line from the adapter from the audio adapter line in and outs to the analog ground on the second board or have as much of the ground plane as possible be audio ground and isolate digital ground as much as possible? Should the two be tied together at one pin on the teensy? Thanks for any thoughts you may have.

 

[MarkT]

will both receive from and output to the audio adapter

receive and output what? analog or digital (or both)?

 

[DaQue]

receive and output what? analog or digital (or both)?

Just analog audio, line level.

 

[MarkT]

Then just the analog ground pins of the linein/lineout connection pads. You don't want a ground loop,
you don't want digital hash coming in from the digital ground.

 

[Expensive Notes]

Then just the analog ground pins of the linein/lineout connection pads. You don't want a ground loop,
you don't want digital hash coming in from the digital ground.

Thanks for your help with this problem. I was getting "digital hash" until I saw this and changed to the line out ground. Who would have thought there would be so many different grounds.