STAC9708 datasheet(7/56 Pages) ETC

7 / 56 page

SigmaTel, Inc.

Preliminary

STAC9708/11

10/02/98

Figure 2. STAC9708 Block Diagram

The STAC9708/11 block diagram, above, illustrates its primary functional blocks. It performs fixed 48K sample

rate D-A & A-D conversion, mixing, and analog processing. The digital interface communicates with the AC'97

controller via the five wire AC-Link and contains the 64 word by 16-bit registers. Four, fixed 48Ks/s DAC’s

support two stereo PCM-out channels for surround sound applications requiring four speakers. The digital mix of

all software sources, including the internal synthesizer and any other digital sources, is performed in the digital

controller. The Mixer block mixes the PCM_OUT with any analog sources, then outputs to LINE_OUT. The

surround DACs are output to DAC_OUT, and this stereo output has independent volume control. In addition, the

surround DACs can be input to the Mixer block and output to LINE_OUT. The MONO_OUT delivers either mic

only or a mono mix of sources from the mixer. The two fixed 48Ks/s ADC’s take any mix of mono or stereo

sources and convert it to a stereo PCM-in signal. All ADC's and DAC's operate at 18-bit resolution.

The STAC9708/11 is designed primarily to support multi-channel, 4-speaker PC audio. However, true AC-3

playback can be achieved for 6-speaker applications by taking advantage of the multi-codec option in the

STAC9708/11. Using this option with a STAC9704/07 as the primary codec, and the STAC9708 as the secondary

codec, 6-channel output can be achieved in an AC'97 architecture. Also, the STAC9708/11 provides for a stereo

enhancement feature, Sigmatel Surround 3D or SS3D. SS3D provides the listener with several options to

expand the soundstage beyond the normal 2-speaker arrangement.

Together with the logic component (controller or advanced core logic chip-set) of AC'97, STAC9708/11 can be

SoundBlaster

and Windows Sound System

compatible. SoundBlaster

is a registered trademark of Creative

Labs. Windows

is a registered trademark of Microsoft Corporation.

LINE_OUT

MONO_OUT

M IC1

M IC2

M IXER

Analog mixing

and

Gain control

DAC

ADC

Power

Management

Digital

Interface

Registers

64 x 16 bits

Mic

Boost

0/20 dB

PCM out DACs

PCM in ADCs

AC-link

4 stereo

sources

2 mono sources

mono

stereo

48Kss

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

RESET

DAC_OUT

DAC

ID0

ID1

Multi-Codec

STAC9708 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

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