Stability Analysis In Multiple Loop Systems

SigmaTel's STAC9721 and STAC9723 are general-purpose 18-bit stereo, full-duplex audio CODECs that adhere to the AC'97 (Audio Codec 97 Component Specification Rev. 2.1) specifications. These devices utilize SigmaTel's proprietary Sigma-Delta technology to achieve a DAC signal-to-noise ratio (SNR) exceeding 95 dB. The integrated DACs, ADCs, and mixer are accompanied by various analog I/O options, including four analog line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono output channel. Additional features include SigmaTel's 3D stereo enhancement technology (SS3D) and an extra true line-level output for headphones or speaker amplifiers. The STAC9721 and STAC9723 can function as secondary codecs in conjunction with primary codecs such as the STAC9700, STAC9704, STAC9707, STAC9744, STAC9745, or the 4-channel STAC9708, allowing for multiple codec configurations that comply with the AC'97 Rev. 2.1 specification. This setup can support up to six-channel output, enabling AC-3 playback for DVD applications. Communication with the STAC9721 and STAC9723 is facilitated through a five-wire AC-Link interface compatible with any AC-Link capable controller or advanced core logic chipset. These devices are housed in a 48-pin TQFP package compliant with AC'97, making them suitable for integration into motherboards, daughter boards, add-on cards, or AMR/MDC cards.

The STAC9721 and STAC9723 audio CODECs are designed for high-performance audio applications, providing robust features for both consumer and professional audio systems. The 18-bit resolution ensures high-quality audio playback and recording, while the full-duplex capability allows simultaneous audio input and output, making these CODECs ideal for applications such as voice-over-IP, multimedia PCs, and home theater systems.

The integration of Sigma-Delta technology is key to achieving a high DAC SNR, which is crucial for minimizing noise and distortion in audio signals, thus enhancing the overall audio experience. The extensive analog I/O options allow for flexible connectivity with various audio sources and outputs, catering to diverse application requirements. The inclusion of 3D stereo enhancement (SS3D) provides an immersive audio experience by simulating a surround sound environment, which is particularly beneficial for gaming and multimedia applications.

The multi-codec configuration capability enables designers to create complex audio systems that can handle multiple audio streams, essential for modern multimedia applications. The ability to achieve up to six-channel output also supports advanced audio formats like AC-3, making the STAC9721 and STAC9723 suitable for DVD playback and other high-fidelity audio applications.

The AC-Link interface simplifies communication between the audio CODEC and the host controller, ensuring efficient data transfer and synchronization. The 48-pin TQFP package allows for easy integration into various electronic designs, whether on mainboards or as part of expansion cards, thus providing versatility in design implementation.

Overall, the STAC9721 and STAC9723 audio CODECs represent a robust solution for high-quality audio processing, meeting the demands of modern audio applications while offering flexibility and ease of integration.SigmaTels STAC9721 STAC9723 is a general-purpose 18-bit stereo, full duplex, Audio CODEC that conforms to the Analog component specification of AC`97 (Audio Codec 97 Component Specification Rev. 2. 1). The STAC9721 STAC9723 incorporates SigmaTels proprietary Sigma-Delta technology to achieve a DAC SNR in excess of 95dB.

The DACs ADCs and mixer are integrated with Analog I/Os, which include four Analog line-level stereo inputs, two Analog line-level mono inputs, two stereo outputs, and one mono output channel. Also included are SigmaTels 3D stereo enhancement SS3D, and an extra true line-level out for Headphones or speaker Amplifiers The STAC9721 STAC9723 may be used as a secondary codec, with the STAC9700/STAC9704/STAC9707/STAC9744/STAC9745 or a 4-channel STAC9708 as the primary, in multiple codec configurations conforming to the AC`97 Rev.

2. 1 specification. This configuration CAN provide up to six-channel output, providing AC-3 playback for DVD applications. The STAC9721 STAC9723 communicates via the five-wire AC- Link Interface with any AC-Link capable controller or advanced core Logic chip-set.

Packaged in an AC`97 compliant 48-pin TQFP, the STAC9721 STAC9723 CAN be placed on motherboards, daughter boards, add- on cards or AMR/MDC cards. By Unkown 🔗 External reference