STAC9766 Datasheet, PDF (89/97 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

STAC9766/9767
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
PC AUDIO
13.3. Analog I/O
These signals connect the STAC9766/9767 to analog sources and sinks, including microphones and
speakers.
Table 37. Analog Connection Signals
Pin Name
PC-BEEP
PHONE
AUX_L
AUX_R
VIDEO_L
VIDEO_R
CD_L
CD_GND^†
CD_R
MIC1
MIC2
LINE_IN_L
LINE_IN_R
LINE_OUT_L
LINE_OUT_R
MONO_OUT
HP_OUT_L
HP_COMM
HP_OUT_R
Pin #
12
13
14
15
16
17
18
19
20
21
22
23
24
35
36
37
39
40
41
Type
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
O
O
O
O
O
O
Description
PC Speaker beep pass-through
From telephony subsystem speakerphone
Aux Left Channel
Aux Right Channel
Video Audio Left Channel
Video Audio Right Channel
CD Audio Left Channel
CD Audio analog signal return ^†
CD Audio Right Channel
Desktop Stereo or Mono Microphone Input
Stereo or Second Mono Microphone Input
Line In Left Channel
Line In Right Channel
Line Out Left Channel
Line Out Right Channel
To telephony subsystem speakerphone
Headphone Out Left Channel
Headphone Ground Return
Headphone Out Right Channel
Note: * Any unused input pins should be tied together through a capacitor (0.1 µF suggested) to
ground, except the MIC inputs which should have their own capacitor to ground if not used.
Note: ^† The CD_GND signal is an AC signal return for the two CD input channels. It is normally
biased at about 2.5V. The name of the pin in the AC97 specification is CD_GND, and this has
confused many designers. It should not have any DC path to GND. Connecting the CD_GND
signal directly to ground will change the internal bias of the entire CODEC, and cause significant
distortion. If there is no analog CD input, then this pin can be No-Connect.
IDT™
89
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06