STAC9766XXTAEYYX datasheet(7/97 Pages) IDT

部品番号	STAC9766XXTAEYYX

部品情報	TWO-CHANNEL, 20-BIT, AC??7 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

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メーカー	IDT [Integrated Device Technology]

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STAC9766/9767

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

PC AUDIO

IDT™

7

STAC9766/9767

V 7.4 12/06

TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

AC-Link to any digital component of AC'97 providing flexibility in the audio system design. Packaged

in an AC'97 compliant 48-pin TQFP, the STAC9766/9767 can be placed on a motherboard, daughter

boards, PCI, AMR, CNR, MDC or ACR cards.

The STAC9766/9767 block diagram is illustrated in Figure 1. It provides variable sample rate Digi-

tal-to-Analog (DA) and Analog-to-Digital (AD) conversion, mixing, and analog processing. Supported

audio sample rates include 48KHz, 44.1KHz, 32 KHz, 22.05KHz, 16KHz, 11.025KHz, and 8KHz;

additional rates are supported in the STAC9766/9767 soft audio drivers. All ADCs and DACs oper-

ate 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 microphone only, or a mono mix of sources from the MIXER. The stereo

variable 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 and 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 STAC9766/9767 includes full Stereo Microphone Pre-Amp support and can be used with the

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

and options.

The STAC9766/9767 includes jack sensing on the Headphone and Line_Out. The STAC9766/9767

jack sense can detect the presence of devices on the Headphone and Line Outputs and on both Mic

inputs. With proprietary IDT current- and impedance-sensing techniques, the impedance load on the

Headphone and Line Outputs can also be detected. The GPIOs on the STAC9766/9767 remain

available for advanced configurations.

The STAC9766/9767 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 infor-

mation 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 configu-

ration of the audio subsystem without end-user intervention. For example, the BIOS can populate

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 infor-

mation, the IDT driver will automatically provide to the Volume Control Panel only the volume sliders

that are implemented in the system, thus improving the end-user's experience with the PC.

The information in the Extended Paging Registers will also allow for automatic configuration of

microphone inputs, the ability to switch between SPDIF and analog outputs, the routing of the mas-

ter volume slider to the proper physical output, and SoftEQ configurations. The fully parametric IDT

SoftEQ can be initiated upon jack insertion and sensed impedance levels.

The STAC9766/9767 also offers two styles of PC BEEP, Analog and Digital. The digital PC BEEP is

a new feature added to the AC’97 Specification Rev 2.3.

The STAC9766/9767 is designed primarily to support stereo (2-speaker) audio. True AC-3 playback

can be achieved for 6-speaker applications by taking advantage of the multi-CODEC option avail-

able in the STAC9766/9767 to support multiple CODECs in an AC'97 architecture. Additionally, the

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