STAC9704 datasheet(6/49 Pages) HYNIX

6 / 49 page

SigmaTel, Inc.

STAC9704/7

10/02/98

Figure 2. STAC9704 Block Diagram

The STAC9704/7 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. Two fixed 48Kss DAC’s

support a stereo PCM-out channel which contains a mix generated in the AC’97 controller of all software sources,

including the internal synthesizer and any other digital sources. The Mixer block mixes the PCM-out with any

analog sources, then outputs to LINE_OUT and LNLVL_OUT. The MONO_OUT delivers either mic only or a

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

convert it to a stereo PCM-in signal. All ADCs and DACs operate at 18-bit resolution.

The STAC9704/7 is designed primarily to support stereo, 2-speaker PC audio. However, multi-channel encoded

stereo can be played out through the LINE_OUT and LNLVL_OUT.

This encoded signal can be played on

normal stereo speakers, or sent to consumer equipment or other decoding devices via LINE_OUT and

LNLVL_OUT to an analog input connection for multi-channel playback.

As an option, the STAC9704/07

provides for a stereo enhancement feature, Sigmatel Surround 3D (SS3D). SS3D provides the listener with

several options to expand the soundstage beyond the normal 2-speaker arrangement.

Together with the logic component (controller) of AC’97, STAC9704/7 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

MIC1

MIC2

MIXER

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

LNLVL_OUT

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