Integrating Mixed-Signal Solutions Stereo AC'97 Codec with Multi-

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STAC9744/45
Integrating Mixed-Signal Solutions
Stereo AC'97 Codec with Multi-Codec Option On-Chip SRCs
DESCRIPTION
SigmaTel's STAC9744 general-purpose 18-bit stereo, full duplex, audio codec that conforms analog component specification AC'97 (Audio Codec Component Specification Rev. 2.1). STAC9744 incorporates SigmaTel's proprietary technology achieve excess line through greater than DACs, ADCs, mixer integrated with analog I/Os, which include four analog line-level stereo inputs, analog linelevel mono inputs, stereo outputs, mono output channel. Also included SigmaTel's stereo enhancement (SS3D), Variable Sample Rate Converters, extra true line-level headphones speaker amplifiers. STAC9744 used secondary codec, with STAC9704/07/21/23 4-channel STAC9708 primary, multiple codec configurations conforming AC'97 Rev. specification. This configuration provide six-channel output, delivering AC-3 playback applications. STAC9744 communicates five-wire AC-Link interface with AC-Link capable controller advanced core logic chip-set. Packaged AC'97 compliant 48-pin TQFP, STAC9744 placed motherboards, daughter boards, addon cards docking stations.
OVERVIEW
Highest noise reduction (103dB) codec. provide 4-channel stereo support when paired with STAC9700, STAC9704, STAC9721 6channel surround sound support with AC-3 playback applications when paired with STAC9708.
FEATURES High performance technology Energy saving power down modes 18-bit full duplex stereo ADC, DACs AC-Link protocol compliance Variable Sample Rate architecture Supports mixer bypass mode Mini-Port driver available compatible with STAC9704/21/56 SigmaTel Surround (SS3D) Stereo
Enhancement
EAPD External Amplifier Power Down
Control
Multi-Codec option (Intel AC'97 2.1) analog line-level inputs 48-pin TQFP through Mixer Simplified operation +3.3V (STAC9745) (STAC9744) operation
ORDERING INFORMATION
Part Number STAC9744T STAC9745T Package 48-pin TQFP 1.4mm 48-pin TQFP 1.4mm Temp Range Supply Range DVdd 3.3V 5.0V, AVdd 5.0V DVdd 3.3V, AVdd 3.3V
2-9744-P1-2.0-1100
STAC9744/45
Stereo AC'97 Codec with Multi-Codec Option On-Chip SRCs
STAC9744/45 BLOCK DIAGRAM
AC-Link
SYNC BIT_CLK SDATA_OUT SDATA_IN0 SDATA_IN1 RESET#
Power Management
stereo sources DACs Variable Sample Rate
mono sources Stereo Mono LNLVL_OUT
Digital Interface
Registers 64x16 bits
MIXER
ADCs Variable Sample Rate Analog mixing Gain Control
LINE_OUT MONO_OUT
Boost 0/20
MIC1 MIC2
SPECIFICATIONS Mixer Bypass Mode Analog LINE_OUT SNR: Digital SNR: Digital SNR: Total Harmonic Distortion: 0.02 Crosstalk between Input Channels: Spurious Tone Rejection: RELATED MATERIALS STAC9744/45 Data Sheet Surround Control Software Surround Secondary Line Control Software Reference Design Schematics CNR, ACR, Intel AC'97 Home Page ADDITIONAL SUPPORT
Additional product company information obtained going SigmaTel website
www.sigmatel.com
Copyright 2000 SigmaTel, Inc. rights reserved. contents this document protected copyright reproduced without express written consent SigmaTel, Inc. SigmaTel, SigmaTel logo, combinations thereof trademarks SigmaTel, Inc. Other product names used this publication identification purposes only trademarks registered trademarks their respective companies. contents this document provided connection with SigmaTel, Inc. products. SigmaTel, Inc. made best efforts ensure that information contained herein accurate reliable. However, SigmaTel, Inc. makes warranties, express implied, accuracy completeness contents this publication providing this publication IS". SigmaTel, Inc. reserves right make changes specifications product descriptions time without notice, discontinue make changes products time without notice. SigmaTel, Inc. does assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential, incidential damages.
2-9744-P1-2.0-1100

Integrating Mixed-Signal Solutions Stereo AC'97 Codec with Multi-

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