STAC9752 Datasheet, PDF (87/95 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING

STAC9752/9753
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
12.2. Analog I/O
These signals connect the STAC9752/9753 to analog sources and sinks, including microphones and
speakers.
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
Table 33. Analog Connection Signals
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 (Do NOT ground. See note.^†)
CD Audio Right Channel
Desktop Microphone Input
Second 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: * Unused input pins should be tied together and connected to ground through a capacitor (0.1 µF
suggested), except the MIC inputs which should have a separate capacitor to ground.
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 serious distortion. If there is no analog CD
input, then this pin can be No-Connect.
IDT™
87
STAC9752/9753
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
REV 3.3 1206