STAC9752A datasheet(7/106 Pages) IDT

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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

The STAC9752A/9753A are standard 2-channel stereo CODEC. With IDT’s headphone drive capa-

bility, headphones can be driven without an external amplifier.

The STAC9700/21/44/56/08/84/50/66 may be used as a secondary or tertiary CODEC, with the

STAC9752A/9753A as the primary, in a multiple CODEC configuration conforming to the AC'97 Rev.

2.3 specification. This configuration can provide the true six-channel, AC-3 playback required for

DVD applications.

The STAC9752A/9753A communicates via the five wire AC-Link to any digital component of AC'97,

providing flexibility in the audio system design.

Packaged in an AC'97 compliant 48-pin LQFP or in the 32-pad/pin QFN, the STAC9752A/9753A can

be placed on motherboards, daughter boards, PCI, AMR, CNR, MDC or ACR cards.

The STAC9752A/9753A block diagram is illustrated in Figure 1.

The STAC9752A/9753A provides variable sample rate Digital-to-Analog (DA) and Analog-to-Digital

(AD) conversion, mixing, and analog processing. Supported audio sample rates include 48KHz,

44.1KHz, 32KHz, 22.05KHz, 16KHz, 11.025KHz, and 8KHz; additional rates are supported in

the STAC9752A/9753A soft audio drivers All ADC's and DAC's operate at 20-bit resolution.

Two 20-Bit DACs convert the digital stereo PCM_OUT content to audio. The MIXER block combines

the PCM_OUT with any analog sources to drive the LINE_OUT and HP_OUT outputs. The

MONO_OUT delivers either mic only, or a mono mix of sources from the MIXER. The stereo, vari-

able-sample-rate, 20-bit ADCs provide record capability for any mix of mono or stereo sources, and

deliver a digital stereo PCM-in signal back to the AC-Link. The microphone input in mono mode and

the mono mix input can be recorded simultaneously, thus allowing for an all digital output in support

of the digital-ready initiative. For a digital-ready record path, the microphone is connected to the left

channel ADC while the mono output of the stereo mixer is connected to right channel ADC.

The STAC9752A/9753A includes full Stereo Microphone Pre-Amp support and can be used with the

10, 20 and 30dB Microphone Boost options. This integration allows for additional cost savings and

options.

The STAC9752A/9753A also includes IDT’s Universal Jacks™ functionality for jack interchangeabil-

ity. The STAC9752A/9753A includes internal jack sensing using proprietary current- and imped-

ance-sensing techniques. The impedance load on any of the inputs or outputs, including the

Headphone and Line Outputs, can be detected. This enables jack sensing on the Headphone and

Line_Out. The STAC9752A/9753A jack sense can detect the presence of devices on the Head-

phone and Line Outputs and on both Mic inputs.

The STAC9752A/9753A implementation of jack sense uses the Extended Paging Registers defined

by the AC'97 2.3 Specification. This allows for additional registry space to hold the identification

information about the CODEC, the jack sensing details and results, and the external surroundings of

the CODEC. The information within the Extended Paging Registers will allow for the automatic con-

figuration of the audio subsystem without end-user intervention. For example, the BIOS can popu-

late the Extended Paging Registers with valuable information for both the audio driver and the

operating system such as gain and attenuation stages, input population and input phase. With this

input information, the IDT driver will automatically provide to the Volume Control Panel only the vol-

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