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