STAC9750 datasheet(6/73 Pages) IDT

6 / 73 page

STAC9750/9751

VALUE-LINE TWO-CHANNEL AC’97 CODECS

PC AUDIO

IDT™

STAC9750/9751

V 5.8 103106

VALUE-LINE TWO-CHANNEL AC’97 CODECS

isters. The two 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 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

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

ready initiative. All ADCs operate at 18-bit resolution and DACs at 20-bit resolution. 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. Make sure the microphone input is not connected to

the stereo mixer when in this mode.

The STAC9750/9751 supports General Purpose Input/Output (GPIO), as well as SPDIF output.

These digital I/O options provide for a number of advanced architectural implementations, with vol-

ume controls and digital mixing capabilities built directly into the CODEC.

The STAC9750/9751 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 STAC9750/9751 to support multiple CODECs in an AC'97 architecture. Additionally, the

STAC9750/9751 provides for a stereo enhancement feature, IDT Surround 3D (SS3D). SS3D pro-

vides the listener with several options for improved speaker separation beyond the normal 2/

4-speaker arrangements.

Together with the logic component (controller or advanced core logic chip-set) of AC'97, STAC9750/

9751 can be SoundBlaster® and Windows Sound System® compatible with IDT’s WDM driver for

WIN 98/2K/ME/XP.

SoundBlaster is a registered trademark of Creative Labs.

Windows is a registered trademark of Microsoft Corporation.

1.3.

STAC9750/9751 Block Diagram

Figure 1. STAC9750/9751 Block Diagram

HP_OUT

AC-link

Digital

Interface

Registers

64x16 bits

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

RESET#

Power

Management

DAC

ADC

PCM out DACs

PCM in ADCs

4 stereo

sources

2 mono

sources

MONO_OUT

Mic Boost

0,20 or 30 dB

MIC1

Stereo

Mono

MIXER

Analog mixing

and Gain Control

MIC2

LINE_OUT

Multi-Codec

CID0

CID1

SPDIF

Variable Sample Rate

20-Bit DACs and

18-Bit ADCs

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