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Professional AC'97 Rev 2.3 Audio CODEC
General Description

The ALC658 has six 20-bit DAC channels, two pairs of stereo 18-bit ADC, and an AC'97 2.3 compatible six-channel audio CODEC designed for PC multimedia systems. The ALC658 incorporates proprietary converter technology to achieve 100dB sound quality, meeting performance requirements on PC99/2001 systems and placing PC sound quality at the same level as consumer equipment.

The ALC658 CODEC provides three pairs of stereo outputs, with 6-bit volume controls and multiple stereo and mono inputs, along with flexible mixing, and gain and mute functions to provide a complete integrated audio solution for PCs. The digital interface circuitry of the ALC658 CODEC operates from a 3.3V power supply for use in notebook and PC applications. The ALC658 integrates 50mW/20ohm headset audio amplifiers at Front-Out and AUX. Both are designed to be analog inputs and outputs automatically detected by hardware (Universal Audio Jack®).

To save BOM costs for motherboard makers, the ALC658 features a built-in 14.318M to 24.576MHz PLL, saving the cost of an extra 24.576MHz crystal. A PCBEEP generator is integrated and can be programmed by the BIOS to generate POST beeps without a buzzer. The ALC658 also supports S/PDIF input and output functions, offering easy connection of PCs to consumer electronic products such as AC3 decoders/speakers, and mini disk devices.

The ALC658 supports host/soft audio from Intel ICHx chipsets, as well as audio controller based VIA/SIS/ALI/AMD/nVIDIA/ATI chipsets. Bundled Windows series (98/ME/NT/2000/XP) and Linux drivers, EAX/Direct Sound 3D/I3DL2/A3D compatible sound effect utilities (supporting Karaoke, 26 types of environment sound emulation, 10-band equalizer), HRTF 3D positional audio, and Sensaura™ 3D (optional), providing an excellent entertainment package and game experience for PC users. In addition, the ALC658 is embedded with an impedance sensing capability to detect when a device has been connected to input or output jacks.

  • Meets performance requirements for audio on PC99/2001 systems
  • Meets Microsoft WHQL/WLP 2.0 audio requirements
  • Six-channel DA converters with variable rate
  • Two pairs of stereo AD converters with variable rate
  • Complies with AC'97 2.3 specifications
    • Front-Out, Surround-Out, CEN/LFE-Out, MIC-In, and Line-In Jack Sensing
    • 14.318MHz to 24.576MHz PLL to eliminate crystal
    • 12.288MHz BITCLK input
    • Integrated PCBEEP generator to save buzzer
    • Interrupt capability
    • Page and analog Plug & Play registers
  • Three analog line-level stereo inputs with 5-bit volume control: LINE_IN, CD, AUX
  • High quality differential CD input
  • Two analog line-level mono input: PCBEEP, PHONE-IN
  • Two software selectable MIC inputs
  • A dedicated Front-MIC input for front panel applications (software selectable)
  • Dedicated Front-Out pin
  • +6/12/20/30dB boost preamplifier for MIC input
  • LINE input shared with surround out, MIC input shared with Center and LFE out (FlexJack®)
  • 6-Bit volume control for Front-Out, Surround-Out, and CEN/LFE-Out
  • Both Front-Out and AUX have integrated 50mW/20ohm amplifiers
  • External Amplifier Power Down (EAPD)
  • Power management and enhanced power saving features
  • Stereo MIC record for AEC/BF application
  • Supports Power-Off CD function
  • Adjustable VREFOUT control
  • Supports double sampling rate (96KHz) of DVD audio playback
  • Support 32K/44.1K/48K/96KHz S/PDIF output
  • Support 32K/44.1K/48KHz S/PDIF input
  • 2 Universal Audio Jacks (UAJ®) for front panel
  • 5 Jack Detect pins for automatic jack sensing
  • Power support: Digital: 3.3V; Analog: 3.3V/5V
  • Standard 48-pin LQFP package
  • EAX™ 1.0 & 2.0 compatible
  • Direct Sound 3D™ compatible
  • A3D™ compatible
  • I3DL2 compatible
  • HRTF 3D positional audio
  • Sensaura™ 3D enhancement (optional)
  • 10-band Software EQualizer
  • Voice cancellation and key shifting in Karaoke mode
  • AVRack® Media Player
  • Configuration Panel for improved user convenience
  • Multimedia PCs
  • 3D PC games
  • Information appliances (IA)
  • Voice recognition
  • Audio conferencing
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