2.10 Audio/Voice Interface Routing
For capless analogy audio interface layout, the following rules ensure better audio noise rejection.
- Width of each trace and the gap must be 8~10 mil.
- The clearance of ground plane must be wider than 10 mils.
- The Via holes of GND must be placed closely along the AOHPR/AOHPL trace.
For single-end analogy audio output layout, the following rules ensure better audio noise rejection.
- The traces of AOHPR and AOHPL must be 1W (10 mils to 15 mils) width, and one ground trace must be added between those traces to prevent the crosstalk condition.
- Width of each trace and the gap must be 8~10 mil.
- The clearance of ground plane must be wider than 10 mils
- The Via holes of GND must be placed tightly beside the AOHPR/AOHPL.