Program Description

ALC658 Professional AC'97 Rev 2.3 Audio CODEC General Description 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.