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50QMA
50QMA
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• Support parallel 4-wire power switch interface
The ALC655 is a 16-bit, full duplex AC'97 2.3 compatible six channels audio CODEC designed for PC multimedia
systems, including host/soft audio and AMR/CNR based designs. The ALC655 incorporates proprietary converter
technology to meet performance requirements on PC99/2001 systems. The ALC655 CODEC provides three pairs of
stereo outputs with 5-Bitvolume controls, a mono output, and multiple stereo and mono inputs, along with flexible
mixing, gain and mute functions to provide a complete integrated audio solution for PCs. The digital interface
circuitry of the ALC655 CODEC operates from a 3.3V power supply for use in notebook and PC applications. The
ALC655 integrates 50mW/20ohm headset audio amplifiers at
Front-Out and Surr-Out, built-in 14.318M 24.576MHz PLL and PCBEEP generator, those can save BOM costs. The
ALC655 also supports the S/PDIF input and output function, which can offer easy connection of PCs to consumer
electronic products, such as AC3 decoder/speaker and mini disk devices. ALC655 supports host/soft audio from Intel
ICH6 chipsets as well as audio controller based VIA/SIS/ALI/AMD/nVIDIA/ATI chipset. Bundled Windows series
drivers (WinXP/ME/2000/98/NT), EAX/
Direct Sound 3D/ I3DL2/ A3D compatible sound effect utilities (supporting Karaoke, 26-kind of environment sound
emulation,10-band equalizer), HRTF 3D positional audio and Sensaura™ 3D (optional) provide an excellent
entertainment package and game experience for PC users. Besides, ALC655 includes Realtek’s impedance sensing
techniques that makes device load on outputs and inputs can be detected.
1.2.6 AC’97 Audio System: Advance Logic, Inc, ALC655
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