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ENGLISH DATASHEETS for Realtek ALC202
Realtek ALC202 (sound chip)
Release: 1.28 from 2002-07-30
File: alc202a_datasheet_1.28.pdf
Downloaded: 610×
Designed only for Realtek ALC202 ALC202A
The ALC202/ALC202A is an 18-bit, full duplex AC'97 2.2 compatible stereo audio CODEC designed for PC multimedia systems, including host/soft audio and AMR/CNR based designs. The ALC202 incorporates proprietary converter technology to achieve a high SNR, greater than 90 dB. The ALC202 AC'97 CODEC supports multiple CODEC extensions with independent variable sampling rates and built-in 3D effects. The ALC202 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 digital interface circuitry of the ALC202 CODEC operates from a 5V/3.3V power supply with EAPD (External Amplifier Power Down) control for use in notebook and PC applications. The ALC202 integrates a 50mW/8Ω headset audio amplifier into the CODEC, saving BOM costs. The ALC202 also supports the SPDIF out function, which is compliant to AC'97 2.2, which can offer easy connection of PCs to consumer electronic products, such as AC3 decoder/speaker and mini disk devices. The ALC202 CODEC supports host/soft audio from Intel 810/815/820/845 chipsets as well as audio controller based VIA/SIS/ALI chipsets. Bundled Windows series drivers (Win95/98/ME/2000/XP/NT) and sound effect utilities (supporting Karaoke, 26-kind of environment sound emulation, 10-band equalizer) provide an excellent entertainment package for PC users. Finally, internal PLL circuits generate required timing signals, eliminating the need for external clocking devices.

There are two differences between the ALC202 and the ALC202A. First, the ALC202 includes outputs for headphones with an op-amp, and in the ALC202A, those outputs are for True Line output and have no op-amp. Second, the Line Out channels on the ALC202 has no op-amp (1.0Vrms), where the ALC202A includes an op-amp (1.0Vrms).


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