ALC202 PDF Datasheet – AC97 Audio CODEC

AC’97 (Audio Codec ’97) is a specification for audio codecs and associated controllers used in personal computers and other devices. AC’97 was developed by Intel in the late 1990s and has since become a standard for audio interfaces on motherboards, sound cards, and other computer systems.

Part Number: ALC202

Function: AC97 Audio CODEC

Package: LQFP 48 Pin type

Manufacturer: Realteck, Avance Logic

Images:ALC202 pdf realteck


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


1. Single chip audio CODEC with high S/N ratio (>90 dB)

2. Compliant with AC’97 2.2 & WHQL specifications

3. Support of S/PDIF out is compliant with AC’97 rev2.2 specifications

4. Meets performance requirements for audio on PC2001 systems

5. Meets Microsoft PC99 & WLP 2.0 audio requirements

6. 3D Stereo Enhancement

7. Multiple CODEC extension capability

8. External Amplifier Power Down (EAPD) capability

9. High performance converter technology


ALC202 pinout datasheet


Here are some key points about AC’97 audio codecs:

1. Audio Codec: An AC’97 audio codec is an integrated circuit that performs analog-to-digital (ADC) and digital-to-analog (DAC) conversion for audio signals. It interfaces with the audio controller on the host system to process audio data.

2. Multichannel Audio: AC’97 codecs support multichannel audio configurations, allowing for stereo, 4-channel, 5.1-channel, and other audio setups.

3. Sampling Rates: AC’97 supports various sampling rates for audio playback and recording, including commonly used rates like 44.1 kHz (CD audio), 48 kHz (DVD audio), and more.

ALC202 PDF Datasheet

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