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ENGLISH DATASHEETS for Realtek ALC250
Realtek ALC250 (sound chip)
Release: 1.3 from 2005-12-06
File: alc250_datasheet_1.3.pdf
Downloaded: 589×
Designed only for Realtek ALC250 ALC250-LF
The ALC250 is a 20-bit DAC and 18-bit ADC full duplex AC'97 2.3 compatible stereo audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR based designs. The ALC250 incorporates proprietary converter technology to achieve a high SNR, greater than 100 dB, sensing logics for device reporting, and Universal Audio Jack® to enhance user convenience. The ALC250 AC'97 CODEC supports multiple CODEC extensions with independent variable sampling rates and built-in 3D effects. The ALC250 CODEC provides two pairs of stereo outputs with independent volume 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 circuitry of the ALC250 CODEC operates from a +3.3V digital power and +5V analog power supply with EAPD (External Amplifier Power Down) control for use in notebook and PC applications. The ALC250 integrates a 50mW/20Ω headset audio amplifier into the CODEC, saving BOM costs. The ALC250 also supports the SPDIF out function, which complies with AC'97 2.3, and offers easy connection of PCs to consumer electronic products, such as AC3 decoder/speaker and mini disk devices.

The ALC250 CODEC supports host/soft audio from Intel ICHx 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, and 10 software equalizer bands), HRTF 3D positional audio and Sensaura™ 3D (optional) provide an excellent entertainment package and game experience for PC users. Integrated 14.318M to 24.576MHz PLL generate required clock to eliminate the need for external crystal. The ALC250 also builds-in seven bands of digital hardware equalizer and cascades one lowpass filter, five bandpass filters, and one highpass filter. It optimizes frequency response on mobile PC speakers.


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