STAC9752A Datasheet, PDF (93/106 Pages) Integrated Device Technology – AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
PC AUDIO
11.4. Pinout List 32-pad QFN Package
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Table 34. STAC9752A/9753A 32 Pad QFN Pin List
PIN Name
CLOCK_IN
SDATA_OUT
BIT_CLK
DVSS2
SDATA_IN
DVDD
SYNC
RESET#
PHONE
CD L
CD GND **
CD R
MIC 1
MIC 2
LINE IN L
LINE IN R
Pin#
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin Name
AVSS1
VREF IN
VREF_OUT
AFILT1
AFILT2
CAP2
Line_Out_L
Line_Out_R
MONO
AVDD2
HP_L
HP_R
AVSS3
GPIO1
EAPD / GPIO
S/PDIF-OUT
Pin 32: To Disable SPDIF, use an 1KΩ - 1 0 KΩ external pullup resistor.
Pin 11: 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 AC’97 specification is CD_GND, and this has con-
fused 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.
11.5. STAC9752A/9753A Digital I/O
These signals connect the STAC9752A/9753A to its AC'97 controller counterpart, an external crys-
tal, multi-CODEC selection and external audio amplifier.
Table 35. STAC9752A/9753A Digital Connection Signals
Pin Name
48 LQFP 32 QFN
Pin # Pin # ^Type
XTL_IN / CLOCK_IN 2
1
I
XTL_OUT
3
-
I/O
SDATA_OUT
5
2
I
Description
Clock Input
24.576 MHz Crystal
AC-Link Serial Data output
(inbound stream)
Internal Pull-up
/Pull-down
N/A
N/A
N/A
IDT™
93
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206