IDTSTAC9751XXTAEC1XR IDT, Integrated Device Technology Inc, IDTSTAC9751XXTAEC1XR Datasheet - Page 63

• Manufacturer Part Number: IDTSTAC9751XXTAEC1XR
• Description: IC CODEC AC'97 2CH VALUE 48-LQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec '97r

Specifications of IDTSTAC9751XXTAEC1XR

• Resolution (bits): 18 b, 20 b
• Number Of Adcs / Dacs: 2 / 2
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 85 / 89
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STAC9751XXTAEC1XR

IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
10.2. Analog I/O
These signals connect the STAC9750/9751 to analog sources and sinks, including microphones and
speakers.
* 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.
†
about 2.5 V. The name of the pin in the AC’97 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
The CD_GND signal is an AC signal return for the two CD input channels. It is normally biased at
LINE_OUT_R
LINE_OUT_L
MONO_OUT
HP_OUT_R
HP_OUT_L
LINE_IN_R
HP_COMM
LINE_IN_L
Pin Name
PC-BEEP
VIDEO_R
VIDEO_L
CD_GND
PHONE
AUX_R
AUX_L
CD_R
CD_L
MIC1
MIC2
Pin # Type
12
13
14
15
16
17
18
19
20
21
22
23
24
35
36
37
39
40
41
O
I*
O
O
O
O
O
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
I*
PC Speaker beep pass-through
From telephony subsystem speakerphone (or DLP - Down Line Phone)
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 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 (or DLP - Down Line Phone)
Headphone Out Left Channel
Headphone Ground Return
Headphone Out Right Channel
Table 44. Analog Connection Signals
63
†
Description
STAC9750/9751
PC AUDIO
V 5.8 103106