ALC221 PDF Datasheet – High Definition Audio Codec

This post explains for the audio codec.

The Part Number is ALC221.

The function of this semiconductor is High Definition Audio Codec.

The package is QFN-48.

Manufacturer: Realtek Microelectronics


ALC221 datasheet pinout


The ALC221 is a High Definition Audio Codec that integrates 4-channel DAC, 4-channel ADC, and a mono and filter-less Class-D Speaker Amplifier with 2 Watt (rms) output power.

The 4-channel DAC and 4-channel ADC support two independent stereo sound outputs and two
independent stereo inputs simultaneously, supporting multiple streaming playback and output for multimedia applications and voice communication. The codec has high performance and characteristics meets WLP (Windows Logo Program) audio requirements for Windows XP, Windows Vista and Windows 7 systems.


1. HDMI audio driver for Intel and AMD chipsets

2. Direct Sound 3D compatible

3. Enhanced Microphone Acoustic Echo Cancellation (AEC) […]


ALC221 Datasheet