rtd cpuModule CMX47786HX, User Manual

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CMX47786HX RTD Embedded Technologies, Inc.
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Audio, CN11
An audio port is available on CN11. This is an full featured, AC97 compliant port that also provides
for Sound Blaster compatibility. It provides a mono microphone input, stereo line level input, and
a stereo output that can be configured as line level or headphone level. The output is configured in
the BIOS setup utility (see
Configuring with the RTD Enhanced Award BIOS on page 56). When
used as a headphone output, it will drive 32 Ohm speaker at 50mW.
The line input is a pseudo-differential input. A separate ground is provided to reference the left and
right channel. This ground must be externally attached to signal ground. For best results, connect
the line input ground to signal ground at the signal source. The will eliminate any common mode
noise between the source and the cpuModule.
Facing the connector pins, the pinout is
Table 23: Audio Connector CN11
10 PIN DIL Pin Signal Function in/out
1 MIC_VREF 2.2V Supply to bias micro-
phones. 5mA max. pwr
2 MIC_IN Microphone input. 1V RMS
or 0.1V RMS. in
3 GND Signal GND gnd
4 LINE_IN_LEFT Line level input for left chan-
nel. 1V RMS nominal. in/out
5 LINE_IN_GND Signal GND input for line in-
put. THIS MUST BE CON-
NECTED TO GND. For best
results, connect to GND at
the signal source in
6 LINE_IN_RIGHT Line level input for right
channel. 1V RMS nominal.
in/out
7 GND Signal Ground out
8 OUTPUT_LEFT Left channel output. Select-
able as line level (1V RMS)
or headphone. out
9 GND Signal Ground out
10 OUTPUT RIGHT Left channel output. Select-
able as line level (1V RMS)
or headphone.
out
9 7 5 3 1
GND GND LINE_IN_GND GND MIC_VREF
OUT_R OUT_L LINE_IN_R LINE_IN_L MIC_IN
10 8 6 4 2