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ALC888T
Advanced 7.1+2 HD Audio Codec for VoIP Applications
 
General Description

The ALC888T is a high-performance 7.1+2 Channel High Definition Audio Codec providing ten DAC channels that simultaneously support 7.1 sound playback, plus 2 channels of independent stereo sound output (multiple streaming) through the front panel stereo outputs. The chip integrates two stereo ADCs that can support a stereo microphone, and feature Acoustic Echo Cancellation (AEC), Beam Forming (BF), and Noise Suppression (NS) technology for an enhanced VoIP experience.

The ALC888T allows VoIP connection through a traditional phone, offering great convenience and providing an economic solution for user-friendly VoIP. In addition, the ALC888T is able to auto-switch from a VoIP connection to the traditional PSTN service in the event of power failure, and continue to provide functions and services, e.g., emergency call (911) access, providing flexible usage and convenience for users.

All analog IO are input and output capable, and headphone amplifiers are also integrated at each analog output. All analog IOs can be re-tasked according to user's definitions, or automatically switched depending on the connected device type.

Support for 16/20/24-bit S/PDIF input and output offers easy connection of PCs to high-quality consumer electronic products such as digital decoders and speakers. The ALC888T incorporates Realtek proprietary converter technology to achieve 97dB dynamic range playback quality and 90dB dynamic range recording quality, and is designed for Windows Vista premium desktop and laptop systems.

The ALC888T supports host/soft audio from the Intel ICH series chipset, and also from any other HDA compatible audio controller. With EAX/Direct Sound 3D/I3DL2/A3D compatibility, and excellent software utilities like Karaoke mode, environment emulation, software equalizer, HRTF 3D positional audio, the ALC888T provides an excellent home entertainment package and game experience for PC users, combined with easy-to-use VoIP functionality.

 
Features
  • Meets performance requirements for Microsoft WLP 3.0 Premium desktop and mobile PCs
  • Supports VoIP using a standard telephone
  • Supports digital microphone interface for improved voice quality
  • High-performance DACs with 97dB SNR (A-Weighting), ADCs with 90dB SNR (A-Weighting)
  • Ten DAC channels support 16/20/24-bit PCM format for 7.1 sound playback, plus 2 channels of independent stereo sound output (multiple streaming) through the front panel output
  • Two stereo ADCs support 16/20/24-bit PCM format, one for stereo microphone, one for legacy mixer recording
  • All DACs supports 44.1k/48k/96k/192kHz sample rate
  • All ADCs support 44.1k/48k/96k sample rate
  • 16/20/24-bit S/PDIF-OUT supports 44.1k/48k/96k/192kHz sample rate
  • 16/20/24-bit S/PDIF-IN supports 44.1k/48k/96k/192kHz sample rate
  • Up to four channels of microphone array input are supported for AEC/BF applications
  • High-quality analog differential CD input
  • Supports external PCBEEP input and built-in digital BEEP generator
  • Software selectable 2.5V/3.75V VREFOUT
  • Two jack detection pins each designed to detect up to 4 jacks
  • Supports legacy analog mixer architecture
  • Wide range (–80dB ~ +42dB) volume control with 1.5dB resolution of analog to analog mixer gain
  • Software selectable boost gain (+10/+20/+30dB) for analog microphone input
  • All analog jacks are stereo input and output re-tasking for analog plug & play
  • Built-in headphone amplifiers for each re-tasking jack
  • Two GPIOs (General Purpose Input and Output) for customized applications
  • Supports anti-pop mode when analog power AVDD is on and digital power is off.
  • 64-pin LQFP 'Green' package
  • Meets Microsoft WHQL/WLP 3.0 audio requirements
  • WaveRT-based audio function driver for Windows Vista
  • EAX™ 1.0 & 2.0 compatible
  • Direct Sound 3D™ compatible
  • A3D™ compatible
  • I3DL2 compatible
  • HRTF 3D Positional Audio
  • Emulation of 26 sound environments to enhance gaming experience
  • 10-Band Software Equalizer
  • Voice Cancellation and Key Shifting in Karaoke mode
  • Realtek Media Player
  • Enhanced Configuration Panel to improve user experience
  • Microphone Acoustic Echo Cancellation (AEC), Noise Suppression (NS), and Beam Forming (BF) technology for voice application
Applications
  • Desktop multimedia PCs
  • Laptop PCs
  • Information appliances (IA) e.g., set-top box
Download Page Links
Datasheets
Reference Designs

 

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