alc268 Realtek Semiconductor Corporation, alc268 Datasheet - Page 9

• Manufacturer Part Number: alc268
• Description: 2+2 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

ALC268 Series
Datasheet
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
2+2 Channel High Definition Audio Codec
1
Track ID: JATR-1076-21
Rev. 1.3