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.

Figure 2-6. Reference for Capless Audio Output

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.
Figure 2-7. Reference for Single-end Audio Output