ALC268 datasheet(9/80 Pages) REALTEK

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ALC268 Series

Datasheet

2+2 Channel High Definition Audio Codec

Track ID: JATR-1076-21

Rev. 1.3

1. General Description

The ALC268 series (ALC268-VB1/ALC268/ALC268Q) 4-Channel ADC High Definition Audio Codecs

with UAA (Universal Audio Architecture). Featuring two stereo DACs and two stereo ADCs, the 4 DAC

channels 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-GR and ALC268Q-GR meet the current WLP3.10 (Windows® Logo Program)

requirements. The ALC268-VB1-GR is the B version of the ALC268 and meets future WLP

requirements that become effective from 01 June 2008, bringing PC sound quality closer to consumer

electronic devices.

The ALC268 series support 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 series support host audio controller from the Intel ICH series and upcoming PCH chipset,

and also from any other HDA compatible audio controller. With EAX/Direct Sound 3D/I3DL2/A3D

compatibility, and excellent software utilities like environment sound emulation, multiple and

independent software equalizer bands, dynamic range control, optional Dolby® Digital Live, Dolby®

PCEE programs and SRS® TrueSurround HD, the ALC268 provides an excellent multimedia experience

for PC users.

Model Differences

The ALC268-VB1 is fully pin compatible and software backward compatible with the ALC268. Board

designs using the ALC268 can use the ALC268-VB1 directly without PCB (Printed Circuit Board) or

software changes.

Three main functions have been added in the ALC268-VB:

• Meets future Windows® Logo Program (WLP) requirements that become effective from 01 June 2008

• Integrates a DC cancellation filter to cancel DC offset from digital microphones (becoming common

in notebook and Ultra Mobile PCs)

• ADCs support 24-bit format recording

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