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AC'97 (Audio Codec '97; also MC'97 for Modem Codec '97) is an audio codec standard developed by Intel Architecture Labs in 1997. The standard was used in motherboards, modems, and sound cards. It successor is Intel High Definition Audio, which was released in 2004.

Pin out comparisonEdit

Pin AC'97 signal AC'97 signal type HD Audio signal HD Audio signal type
1 MIC analog to MB PORT1 L analog to/from MB
2 AUD_GND ground GND ground
3 MIC BIAS bias power/analog to MB PORT1 R analog to/from MB
4 AUD_GND ground PRESENCE# digital to/from MB
(dongle present detection)
5 FP_OUT_R analog from MB PORT 2R analog to/from MB
6 FP_RETURN_R switched analog loopback to MB SENSE1_RETURN switched digital loopback to MB
(port 1 jack detection)
7 AUD_5V power SENSE_SEND digital from MB (loopback source)
8 KEY missing pin KEY missing pin
9 FP_OUT_L analog from MB PORT 2L analog to/from MB
10 FP_RETURN_L analog to MB SENSE2_RETURN switched digital loopback to MB
(port 2 jack detection)
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