Motherboard Express µATX Technical Reference ManualV2M-P1
Home > Signal Descriptions > Audio CODEC interface

A.1. Audio CODEC interface

The motherboard provides three stacked 3.5mm jack connectors on the rear panel that enable you to connect to the analog microphone and auxiliary line level input and output on the CODEC. If no jack plug is inserted, the tip and sleeve of both the Mic In and Line In jack sockets are connected to analog ground to help prevent noise pickup. Figure A.1 shows the pinouts of the sockets.

Note

A link, LK1, on the motherboard enables a 5V bias voltage to be applied to the microphone.

The available link options are:

  • Fit A-B For BIAS at the tip, standard active microphone.

  • Fit B-C For BIAS at the middle sleeve.

  • Omit For no BIAS, passive microphone.

When no plug is inserted, both the Microphone and Line In jack sockets tip and sleeve are connected to analog ground to avoid noise pickup.

Figure A.1. Audio connectors

To view this graphic, your browser must support the SVG format. Either install a browser with native support, or install an appropriate plugin such as Adobe SVG Viewer.


Copyright © 2009-2013, ARM. All rights reserved.ARM DUI 0447H
Non-ConfidentialID040613
PDF file icon  PDF version
Home > Signal Descriptions > Audio CODEC interface