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SigmaTel, Inc.
Data Sheet
STAC9721
8
04/07/00
04/07/00
1.2 Analog I/O
These signals connect the STAC9721/23 to analog sources and sinks, including microphones and
speakers.
Table 4. Analog Signal List
Signal Name
Type
Description
PC-BEEP
I
PC Speaker beep pass-through
PHONE
I
From telephony subsystem speakerphone (or DLP - Down
Line Phone)
MIC1
I
Desktop Microphone Input
MIC2
I
Second Microphone Input
LINE-IN-L
I
Line In Left Channel
LINE-IN-R
I
Line In Right Channel
CD-L
I
CD Audio Left Channel
CD-GND
I
CD Audio analog ground
CD-R
I
CD Audio Right Channel
VIDEO-L
I
Video Audio Left Channel
VIDEO-R
I
Video Audio Right Channel
AUX-L
I
Aux Left Channel
AUX-R
I
Aux Right Channel
LINE-OUT-L
O
Line Out Left Channel
LINE-OUT-R
O
Line Out Right Channel
MONO-OUT
O
To telephony subsystem speakerphone (or DLP – Down
Line Phone)
LNLVL_OUT_
L
O
True Line Level Out Left Channel
LNLVL_OUT_
R
O
True Line Level Out Right Channel
* Note: any unused input pins should be tied together and connected to ground with a capacitor (0.1 uF
suggested), except the MIC1 and MIC2 inputs which require their own 0.1 uF capacitors to ground if not
used.
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