Alc271x Datasheet < Best >

The ALC271X supports audio playback, delivering studio‑grade sound quality. Variable Sample Rate (VSR) technology allows flexible sample rate conversion, ensuring compatibility with diverse audio sources and formats.

Integrates a built-in speaker amplifier capable of driving small laptop speakers directly without external operational amplifiers.

While a full manufacturer’s datasheet is often protected by NDAs, understanding the core specifications and architecture of the ALC271X is crucial for troubleshooting and design. What is the ALC271X?

Which specific operating system driver or initialization issue are you facing? alc271x datasheet

| Model | Channels | DAC SNR | Package | Key Differences | |-------|----------|---------|---------|-----------------| | | 4‑channel | 98 dB | QFN‑48 | Very similar; shares driver quirks. ALC269 has different COEF tables. | | ALC271X | 4‑channel | 98 dB | QFN‑48 | 2 W Class‑D amp; 4‑pin headset detection quirks in Linux. | | ALC272 | 4‑channel | 98 dB | QFN‑48 | Slightly lower power consumption; different pinout. | | ALC892 | 8‑channel | 108 dB | LQFP‑48 | Premium variant; higher SNR; used in desktop motherboards. | | ALC662 | 5.1‑channel | 93 dB | QFN‑48 | Older, lower‑spec; AC'97 / HD Audio dual interface. |

While exact pinouts can vary slightly across sub-variants (such as the ALC271X-GR), standard functional pin groups include: HD Audio Link Interface

Avoid "crawler" sites that deliver corrupted files or request payment. The ALC271X is an End-of-Life (EOL) component; no legitimate vendor charges for its datasheet. While a full manufacturer’s datasheet is often protected

Supports stereo playback and recording at up to sampling rate.

These pins connect directly to the motherboard’s Southbridge or Processor Audio DSP:

The Realtek ALC271X is a QFN-48 high-definition audio codec featuring up to 24-bit/192kHz resolution, high SNR, and built-in headphone amplifiers. Designed for laptop and desktop integration, it includes jack detection, 3.3V compatibility, and supports multiple audio streams. For detailed specifications, review the IC Components ALC271X-VB6-CG datasheet ALC892 - Realtek | Model | Channels | DAC SNR |

One of the most critical features is the implementation of "Jack Detection" and "Auto-configuration." The ALC271X supports auto-switching between the internal speakers and external headphones. When a user plugs a headset into the audio jack, the codec detects the impedance change and automatically mutes the internal speakers, routing audio to the headphones. This seamless transition is managed through the codec’s firmware interface with the operating system.

Dedicated strictly to analog signaling, these pins demand strict trace isolation: