STAC9752A Datasheet, PDF (92/106 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
11.3. Pin Description for the 32-pad QFN Package
Figure 25. STAC9752A/9753A 32 pad QFN Pin Description Drawing
PC AUDIO
MONO_OUT 25
AVDD2 26
HP_L 27
HP_R 28
AVSS 29
GPIO3 30
EAPD/GPIO4 ₃₁
SPDIF-OUT ₃₂
32 pad QFN
16 LINE_IN_R
15 LINE_IN_L
14 MIC 2
13 MIC 1
12 CD_R
11 CD_GND
10 ^CD_L
9 ^PHONE
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.
IDT™
92
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206