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CX-MB-EVA2 User's Manual Hardware
29
4.9 Audio
An AC’97 codec V2.2 is connected to the AC link of the COM Express module. Footprint
and circuit are compatible to following AC’97 codecs:
VIA VT1612A
Realtek ALC650
Following LF signals are provided by the AC’97 codec:
Mono Microphone
Stereo LineIn
Stereo LineOut
Stereo Headphone
Alternatively a VIA VT1708 HDA codec can be connected to the AC link of the COM
Express module. The audio interface can be selected with Jumper J0701.
Following LF signals are provided by the HDA codec:
Stereo LineIn
Stereo LineOut
Stereo Microfon
Mono Center / Mono LFE
Stereo Surround
Stereo Side
4.9.1 AC'97 codec
4.9.1.1 Mono-Microphone
Bias voltage for capacitor microphones is provided.
Specification:
References: X18
Connector: Kycon ST-3000Mono-Microphone
Pinout: Refer to Table 8
Pin Signal name Function
1 GND Ground
2 MIC_BIAS Bias initial load (ring)
3 MIC NF signal (tip)
Table 13 Pinout Microphone