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The ALC4050 is a single-chip USB 2.0 audio codec with embedded USB 2.0 to I2S and SPDIF interface for high analog and digital audio performance. The ALC4050 integrates stereo analog input and output, USB, I2S, I2C, digital microphone, and SPDIF interfaces to support a standard USB audio device class 《ALC4050音频编解码器：USB到I2S音频控制器与硬件主动降噪技术详解》 Realtek公司的ALC4050是一款集成度极高的单芯片USB 2.0音频编解码器，专为实现高质量模拟和数字音频性能而设计。该芯片集成了立体声模拟输入和输出、USB、I2S、I2C、数字麦克风和SPDIF接口，以支持标准的USB音频设备类应用。ALC4050适用于各种平台，包括Android系统，为移动设备提供强大的音频处理能力。 ### 主要特性 1. **USB 2.0接口**：ALC4050支持高速USB 2.0标准，能够实现高效的数据传输，确保音频流的流畅无损。 2. **I2S和SPDIF接口**：I2S接口用于内部数字音频数据传输，SPDIF接口则为数字音频输出提供了兼容性，可以连接到其他数字音频设备。 3. **模拟输入和输出**：内置的立体声模拟输入和输出，允许用户进行音频信号的采集和播放，确保音质纯净。 4. **数字麦克风接口**：支持数字麦克风输入，增强了录音质量和噪声抑制能力。 5. **硬件主动降噪**：ALC4050内置硬件主动降噪功能，可以有效地减少环境噪音对音频质量的影响，提升用户体验。 6. **I2C控制**：通过I2C接口，可以方便地进行芯片配置和控制，简化系统设计。 ### 应用场景 ALC4050广泛应用于各种音频设备，如智能手机、平板电脑、笔记本电脑、多媒体播放器等。在Android系统中，它可以提供出色的音频体验，支持高清音频回放和录音，同时其硬件主动降噪功能特别适合在嘈杂环境下使用，如户外通话或音乐聆听。 ### 使用注意事项 - **静电防护**：ALC4050在处理时需注意静电防护，不当操作可能导致芯片损坏。应在防静电工作台上打开保护包装，并使用防静电工具。 - **文档更新**：尽管Realtek在制作此数据手册时已尽力确保信息准确，但可能有最新信息未包含其中。在开发过程中，建议联系Realtek代表获取最新资料。 ### 技术支持 Realtek为ALC4050提供详细的技术支持，包括电路设计指导、软件驱动开发以及故障排查等。工程师可以参考该数据手册以了解ALC4050的基本信息，但在实际应用中，还需要结合具体开发环境和需求进行深入研究。 ALC4050作为一款高性能的音频编解码器，其集成的多种接口和硬件功能，使得它在数字音频领域具有广泛的适用性和灵活性。结合Android系统，ALC4050可以为移动设备带来卓越的音频解决方案。

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ALC4050

(PN: ALC4050-CG)

AUDIO CODEC WITH USB TO I2S AUDIO

CONTROLLER AND HARDWARE ACTIVE

NOISE CANCELLATION

DATASHEET

Rev. 0.1

15 May 2018

Track ID:

Realtek Semiconductor Corp.

No. 2, Innovation Road II, Hsinchu Science Park, Hsinchu 300, Taiwan

Tel.: +886-3-578-0211. Fax: +886-3-577-6047

www.realtek.com

ALC4050

Datasheet

Audio Codec with USB To I2S Audio Controller and

Hardware Active Noise Cancellation

Track ID: Rev. 0.1

transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any

means without the written permission of Realtek Semiconductor Corp.

DISCLAIMER

Realtek provides this document ‘as is’, without warranty of any kind. Realtek may make improvements

and/or changes in this document or in the product described in this document at any time. This document

could include technical inaccuracies or typographical errors.

TRADEMARKS

Realtek is a trademark, of Realtek Semiconductor Corporation. Other names mentioned in this document

are trademarks/registered trademarks of their respective owners.

USING THIS DOCUMENT

This document is intended for the hardware and software engineer’s general information on the Realtek

ALC4050 USB2.0 Audio Codec.

Though every effort has been made to ensure that this document is current and accurate, more information

may have become available subsequent to the production of this guide. In that event, please contact your

Realtek representative for additional information that may help in the development process.

ELECTROSTATIC DISCHARGE (ESD) WARNING

This product can be damaged by Electrostatic Discharge (ESD). When handling, care must be taken.

Damage due to inappropriate handling is not covered by warranty.

Do not open the protective conductive packaging until you have read the following, and are at an

approved anti-static workstation.

• Use an approved anti-static mat to cover your work surface.

• Use a conductive wrist strap attached to a good earth ground

• Always discharge yourself by touching a grounded bare metal surface or approved anti-static mat

before picking up an ESD-sensitive electronic component

• If working on a prototyping board, use a soldering iron or station that is marked as ESD-safe

• Always disconnect the microcontroller from the prototyping board when it is being worked on

ALC4050

Datasheet

Audio Codec with USB To I2S Audio Controller and

Hardware Active Noise Cancellation

Track ID: Rev. 0.1

Table of Contents

1. GENERAL DESCRIPTION .............................................................................................................................................. 1

2. FEATURES ......................................................................................................................................................................... 2

2.1. GENERAL HARDWARE FEATURES ................................................................................................................................ 2

2.2. USB CONTROLLER FEATURES ..................................................................................................................................... 3

2.3. MICRO CONTROLLER UNIT .......................................................................................................................................... 4

2.4. CONFIGURABLE GPIO PINS ......................................................................................................................................... 4

2.5. SOFTWARE FEATURES .................................................................................................................................................. 4

3. SYSTEM APPLICATIONS ............................................................................................................................................... 5

4. BLOCK DIAGRAM ........................................................................................................................................................... 6

5. PIN ASSIGNMENTS ......................................................................................................................................................... 7

5.1. PIN ASSIGNMENTS FIGURE ........................................................................................................................................... 7

5.2. PACKAGE AND VERSION IDENTIFICATION .................................................................................................................... 7

6. PIN DESCRIPTIONS ......................................................................................................................................................... 8

6.1. I/O TYPE DESCRIPTION ................................................................................................................................................ 8

6.2. USB TRANSCEIVER INTERFACE ................................................................................................................................... 8

6.3. GPIO, SPL SERIAL FLASH, UART, DMIC INTERFACE ................................................................................................ 9

6.4. I2C INTERFACE ............................................................................................................................................................ 9

6.5. I2S INTERFACE ........................................................................................................................................................... 10

6.6. ANALOG I/O ............................................................................................................................................................... 10

6.7. FILTER/REFERENCE .................................................................................................................................................... 10

6.8. POWER/GROUND ........................................................................................................................................................ 11

7. ELECTRICAL CHARACTERISTICS .......................................................................................................................... 12

7.1. ABSOLUTE MAXIMUM RATINGS ................................................................................................................................ 12

7.2. RECOMMENDED OPERATING CONDITION ................................................................................................................... 12

7.3. DC CHARACTERISTICS ............................................................................................................................................... 12

7.4. AC CHARACTERISTICS ............................................................................................................................................... 13

7.4.1. SPDIF Output Timing ........................................................................................................................................... 13

7.4.2. I2C Control Interface ........................................................................................................................................... 14

7.4.3. I2S Interface Timing ............................................................................................................................................. 15

7.5. ANALOG PERFORMANCE ............................................................................................................................................ 17

8. MECHANICAL DIMENSIONS ...................................................................................................................................... 18

8.1. MECHANICAL DIMENSIONS – QFN 48 6X6MM OUTLINE ............................................................................................ 18

8.2. MECHANICAL DIMENSIONS NOTES ............................................................................................................................ 18

9. APPLICATION CIRCUITS ............................................................................................................................................ 19

10. ORDERING INFORMATION ................................................................................................................................... 19