ALC221 PDF – High Definition Audio Codec – Realtek

Part Number: ALC221


Package: 48-pin QFN Type

Manufacturer: Realtek Microelectronics

ALC221 datasheet pdf



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.

The integrated mono Class-D amplifier is a filter-free design to directly drive mini speaker with as low as 4Ω impedance. Its maximum output power exceeds 2 Watt at 5V power supply. The inside high pass
filter with selectable cut off frequency can prevent speaker burn up by low frequency sound. The class D amplifier output power also could be limited to avoiding damage mini speaker.

It is commonly used in modern computer systems, laptops, and other consumer electronic devices to provide high-quality audio playback and recording capabilities. [ … ]


1. Meets WLP (Windows Logo Program) requirements for Windows XP, Vista and Windows 7

2. Analog DAC output with 97dB Signal-to-Noise Ratio (A-weighting)

3. Analog ADC input with over 90dB Signal-to-Noise Ratio (A-weighting)

4. 4-channel DAC supports 16/20/24-bit PCM format for independent two stereo channel playback


ALC221 Datasheet