AC'97 Rev 2.3 Audio CODEC
Featuring four 16-bit two-channel DACs and a stereo 16-bit ADC, the ALC850 is an AC'97 Rev 2.3 compatible multi-channel audio CODEC designed for PC multimedia systems. The ALC850 incorporates proprietary converter technology and fully meets performance requirements for PC99/2001 systems.
Four pairs of stereo outputs, with 5-bit volume control and multiple stereo and mono inputs, along with flexible mixing, and gain and mute functions, provide a complete integrated audio solution for PCs. The digital interface circuitry of the ALC850 operates from a low-power consumption 3.3V power supply.
Two integrated 50mW/20ohm headphone audio amplifiers provide high-quality personal audio listening. Utilizing Universal Audio Jack® technology, Line-In and Mic-In can also serve as Headphone-Out with an amplifier advantage.
The ALC850 integrates an on-board dual PLL clock generator (14.318MHz and 24.576MHz), saving the cost of a 24.576MHz crystal. A PCBEEP generator is built-in and can be programmed by the BIOS to generate POST beeps without a buzzer. S/PDIF input and output functions are also supported, offering easy connection of PCs to consumer electronic products such as AC3 decoders/speakers, and mini disk devices.
The ALC850 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 ALC850 is embedded with an impedance sensing capability to detect when a device has been connected to input or output jacks.
* Meets performance requirements for audio on PC99/2001 systems
* Meets Microsoft WHQL/WLP 2.0 audio requirements
* Eight-channel DA converter (48KHz)
* Stereo AD converter (48KHz)
* Complies with AC'97 Rev 2.3 specifications:
o Jack sensing on Front-Out, Surround-Out, Cen/LFE-Out, Surround-Back-Out, Mic-In, Line-In, and Front-Mic-In
o Clock input support options:
14.318MHz PLL (may be set to 24.576MHz) to eliminate crystal
12.288MHz BITCLK input
o Integrated PCBEEP generator
o Interrupt capability
o Page and analog Plug & Play registers
* Three analog line-level stereo inputs with 5-bit volume control: Line-In, CD, Aux
* High-quality differential CD input
* Two analog line-level mono inputs: PCBEEP, Phone-In
* A dedicated stereo Front-Mic input for front panel applications
* Line-In, Aux, and Mic-In can be shared with Surround-Out, Surround-Back-Out, and Cen/LFE-Out. (FlexJack®)
* 20dB boost preamplifier for Mic input
* Both Front-Out and Surround-Out integrate 50mW/20ohm amplifiers
* External Amplifier Power Down (EAPD)
* Power management and enhanced power saving features
* Stereo Mic record for AEC/BF application
* Supports Power-Off CD operation
* Adjustable VREFOUT control
* Supports 48KHz S/PDIF output
* Supports 32K/44.1K/48KHz S/PDIF input
* Three Universal Audio Jacks (UAJ®): Front-Out, Line-In, and Mic-In
* Six Jack Detect pins for automatic jack sensing
* Power support: Digital: 3.3V; Analog: 3.3V/5V
* Standard 48-pin LQFP package
* EAX™ 1.0 & 2.0 compatible
* Direct Sound 3D™ compatible
* A3D™ compatible
* I3DL2 compatible
* HRTF 3D positional audio
* Sensaura™ 3D Enhancement (optional)
* 10-band Software Equalizer
* Voice cancellation and key shifting in Karaoke mode
* AVRack® Media Player
* Configuration Panel for enhanced user experience
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