Alc271x Datasheet //free\\ Jun 2026

The remains a critical component in the audio subsystem design for mobile and compact computing devices. Its ability to provide superior sound while maintaining high durability ( ) makes it a reliable choice for engineers.

The analog I/O pins handle real-world acoustic signals and are heavily relied on during circuit diagnostics:

Acer service documentation further confirms that the ALC271X supports 16/24-bit PCM HD Audio with variable sampling rate support up to 192 kHz resolution.

Up to 24-bit resolution supporting 44.1kHz to 96kHz sampling rates. Signal-to-Noise Ratio (SNR): DAC stage achieves approximately 95dB to 98dB (A-weighted). ADC stage achieves approximately 90dB (A-weighted). Power Management and Voltages Digital Core Power (DVDD): Operates at 3.3V nominal. alc271x datasheet

The is the standard "green" RoHS variant in tape‑and‑reel packaging. The VB3‑GR is marketed with enhanced noise cancellation and wide dynamic range features—likely a firmware/driver profile difference rather than hardware change.

This technical analysis covers the internal architecture, pinout configurations, electric specifications, and circuit integration methods outlined in the . Core Architectural Specifications

For engineers integrating the ALC271X into a new design (or repairing a laptop with a failed codec): The remains a critical component in the audio

): Supply lines driving the internal logic circuits and communication state machines. 2. Analog Input/Output Array (Pins 13–36)

High-current outputs routed directly to the internal chassis speakers. 4. Hardware ID, Device ID, and Driver Implementation

The ALC271X is a high-quality audio codec designed for use in modern computers, laptops, and multimedia devices. It delivers high-fidelity sound with stereo and multi-channel playback support, utilizing either AC'97 or HD Audio interfaces. The codec features integrated technologies to enhance the audio experience, including noise cancellation, automatic microphone adjustment, and S/PDIF output support. Up to 24-bit resolution supporting 44

The ALC271x typically supports standard audio interfaces such as I2S (Inter-IC Sound), AC'97, and possibly others, facilitating easy integration with various types of digital audio processors and systems.

The voltage tolerances listed in the official alc271x datasheet are stringent. Here is a quick diagnostic table for the most common failures in the field:

To maximize energy efficiency, the chip segregates its power domains into distinct digital and analog subsystems, minimizing internal interference: Runs on a native 3.3V supply. Analog Power Domain ( AVDDcap A cap V sub cap D cap D end-sub

24MHz clock input from the host controller.