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2+2 Channel High Definition Audio Codec
General Description

The ALC268 series are 4-Channel High Definition Audio Codecs with UAA (Universal Audio Architecture), featuring two stereo DACs and two stereo ADCs. The 4 channels of DAC support stereo sound playback on the rear panel and independent stereo sound output on the front panel simultaneously (multiple streaming). The two stereo ADCs integrate two stereo and independent analog sound inputs.

The ALC268 series incorporates Realtek proprietary converter technology to achieve 95dB dynamic range playback quality and 90dB dynamic range recording quality. They are designed for Windows Vista premium desktop and laptop systems.

The ALC268 series also supports up to 4 digital microphone channels (microphone array) with Acoustic Echo Cancellation (AEC), Beam Forming (BF), and Noise Suppression (NS) technology simultaneously, significantly improving sound quality for PC VoIP applications.
The S/PDIF output offers easy connection of PCs to high quality consumer electronic products such as digital decoders and speakers.

The ALC268 supports host/soft audio from the Intel ICH 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, and software equalizer audio technology to provide an excellent entertainment package and game experience for PC users.


    Hardware Features
  • 95dB SNR DACs meet Windows Vista Premium requirement
  • 90dB SNR ADCs meet Windows Vista Premium requirement
  • Two stereo DACs support 16/20/24-bit PCM format for stereo audio playback
  • Two stereo ADCs support 16/20-bit PCM format for two stereo independent sound inputs
  • All DACs supports 44.1k/48K/96k/192kHz sample rate
  • All ADCs support 44.1k/48k/96kHz sample rate
  • 16/20/24-bit S/PDIF-OUT supports 44.1k/48k/88.2k/96k/192kHz sample rate
  • Up to four channels of digital microphone input are supported
  • Supports MONO line output with independent volume control
  • High-quality analog differential CD input
  • Supports external PCBEEP input and built-in digital BEEP generator
  • Software selectable 2.5V/3.75V/4.2V VREFOUT
  • Two jack detection pins each designed to detect up to 4 jacks
  • 1dB resolution of analog output volume control
  • Programmable 20dB and 40dB boost for analog microphone input
  • Supports hardware digital volume control for digital microphone input
  • Built-in headphone amplifiers for port-A and port-D
  • 4 GPIOs (GPIO0/GPIO3 are digital GPIO shared with digital MIC interface, GPIO1/GPIO2 are analog) for customized applications
  • EAPD (External Amplifier Power Down) is supported
  • Supports Anti-pop mode when analog power AVDD is on and digital power is off
  • Power support: 3.3V digital core power; 1.5V~3.3V digital IO power for HDA link; 3.3V~5.0V analog power
  • Power management features
  • 48-pin LQFP ‘Green’ package
  • 48-pin QFN ‘Green’ package

    Software Features

  • Meets Microsoft WLP 3.0x audio requirements
  • 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 Software Equalizer Bands
  • Voice Cancellation and Key Shifting in Karaoke mode
  • Realtek Media Player
  • Enhanced Configuration Panels (2 feet UI and 10 feet UI for Media Center)
  • Microphone Acoustic Echo Cancellation (AEC), Noise Suppression (NS), and Beam Forming (BF) technology for voice applications


    • Windows Vista premium desktop and laptop PCs
    • Information appliances (IA) with High Definition Audio Controller
    Download Page Links
    Reference Designs


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