STAC9752A datasheet(95/106 Pages) IDT

95 / 106 page

STAC9752A/9753A

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

PC AUDIO

IDT™

STAC9752A/9753A

V 1.5 1206

AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

^ any unused input pins should be tied together and connected through a capacitor (0.1 µF sug-

gested) to ground, except the MIC inputs which should have their own capacitor to ground if not

used.

* Universal Jack™ capable. Only pins 35/36 OR 39/41 may be used to drive headphones. It is

not possible to drive 2 sets of headphones at the same time.

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 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 distor-

tion. If there is no analog CD input, then this pin can be No-Connect.

11.7. STAC9752A/9753A Filter/References

These signals are connected to resistors, capacitors, or specific voltages.

MONO_OUT

To telephony subsystem speakerphone

N/A

HP_OUT_L*

Headphone Out Left Channel

N/A

HP_OUT_R

Headphone Out Right Channel

N/A

Table 37. STAC9752A/9753A Filtering and Voltage References

Signal Name

48 LQFP

Pin #

32 QFN

Pin #

Type

Description

Internal Pull-up

/Pull-down

VREF IN

Analog ground

N/A

VREFOUT

Reference Voltage out 5mA drive

N/A

AFILT0

Anti-Aliasign FIlter Cap - ADC Right Channel

N/A

AFILT1

Anti-Aliasign FIlter Cap - ADC Left Channel

N/A

CAP2

ADC reference Cap

N/A

Table 36. STAC9752A/9753A Analog Connection Signals (Continued)

Pin Name

48 LQFP

Pin #

32 QFN

Pin #

Type

Description

Internal Pull-up

/Pull-down

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