IEC 62680-1-5:2019

Universal serial bus interfaces for data and power - Part 1-5: Common components - USB Audio 3.0 device class definition

IEC 62680-1-5:2019 describes the minimum capabilities and characteristics an audio device shall support to comply with the USB. This document also provides recommendations for optional features.
The Audio Device Class Definition applies to all devices or functions embedded in composite devices that are used to manipulate audio, voice, and sound-related functionality. This includes both audio data (analog and digital) and the functionality that is used to directly control the audio environment, such as Volume and Tone Control. The Audio Device Class does not include functionality to operate transport mechanisms that are related to the reproduction of audio data, such as tape transport mechanisms or CD-ROM drive control.

Interfaces du bus universel en série pour les données et l'alimentation électrique - Partie 1-5: Composants communs - Définition de classes de dispositifs USB Audio 3.0

L'IEC 62680-1-5:2019 décrit les capacités et caractéristiques minimales qu'un dispositif audio doit prendre en charge pour être conforme à l'USB. Le présent document fournit également des recommandations concernant les fonctionnalités facultatives.
La définition de classes de dispositifs audio s'applique à tous les dispositifs ou fonctions intégrés dans des dispositifs composites qui sont utilisés pour manipuler des fonctionnalités audio, vocales et sonores. Cela inclut à la fois les données audio (analogiques et numériques) et les fonctionnalités utilisées pour contrôler directement l'environnement audio, comme les commandes de volume et de tonalité. La classe des dispositifs audio n'inclut pas de fonctionnalité permettant d'utiliser des mécanismes de transport liés à la reproduction de données audio, comme les mécanismes de transport de bande ou la commande d'un lecteur de CD-ROM.

General Information

• Status: Published
• Publication Date: 18-Sep-2019
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• ICS: 33.120.20 - Wires and symmetrical cables
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: TA 18 - Multimedia home systems and applications for end-user networks
• Current Stage: PPUB - Publication issued
• Start Date: 28-Aug-2019
• Completion Date: 19-Sep-2019

Overview

IEC 62680-1-5:2019 is an international standard published by the International Electrotechnical Commission (IEC) that defines the USB Audio 3.0 device class specification. This standard establishes the minimum capabilities and characteristics audio devices must support to comply with Universal Serial Bus (USB) interfaces for both data and power. It primarily targets audio devices or functions embedded within composite devices responsible for managing audio, voice, and sound-related functionalities. Key functionalities covered include analog and digital audio data handling as well as direct control features such as volume and tone control. It excludes transport mechanism controls like tape or CD-ROM drives.

The USB Audio 3.0 device class definition promotes interoperability and consistency across USB audio devices by specifying common components and functional behaviors. Developed by the USB Implementers Forum (USB-IF) and formalized under IEC, this standard ensures manufacturers implement robust and backward-compatible audio device features under the USB architecture.

Key Topics

• Minimum Capabilities for USB Audio Devices: Defines essential features and supported characteristics that all compliant USB audio devices must implement to guarantee basic functionality and interoperability.

• Audio Device Class Definition Scope: Addresses both analog and digital audio data transmission and the control interface for audio processing components such as volume and tone controls.

• Composite Device Integration: Applies to audio functions embedded in composite devices ensuring standardized audio manipulation even within multi-function USB devices.

• Backward Compatibility: Supports legacy USB audio device protocols while enabling advanced features in USB Audio 3.0 to enhance audio quality and device capabilities.

• Audio Interface Association (AIA): Establishes descriptors and class/subclass protocols specific to audio functions to aid device identification and configuration.

• Functional Characteristics: Clarifies clock and power domain management, synchronization types (asynchronous, synchronous), and the architecture for audio data streams and control interfaces.

• Optional Feature Recommendations: Provides guidance encouraging device manufacturers to implement enhanced or additional functionality beyond the minimum requirements.

Applications

• Consumer Audio Devices: Headphones, microphones, sound bars, and speakers that connect to computers and mobile devices via USB interfaces.

• Professional Audio Equipment: Digital mixers, audio interfaces, and studio monitors benefiting from standardized USB audio protocols for reliable data transfer and rich audio control.

• Multimedia Devices: Embedded audio components in composite consumer electronics such as webcams, smart TVs, and gaming consoles.

• Hearing Aids and Assistive Listening Devices: Ensuring seamless USB audio interface functionality for devices requiring precise audio control and quality.

• USB Audio Peripherals Development: Providing manufacturers with a clear framework to design interoperable audio peripherals compliant with international standards.

Related Standards

• IEC 62680 Series: The broader IEC 62680 series covers Universal Serial Bus interfaces for data and power, providing foundational USB system-level specifications.

• USB Device Class Definitions by USB Implementers Forum: Previous releases of USB audio device definitions that this standard builds upon for backward compatibility and functionality progression.

• ISO/IEC Standards on Multimedia and Audio: Complements broader international standards addressing multimedia system performance and interoperability.

• USB Power Delivery Standards: While IEC 62680-1-5 focuses on audio device class definitions, it integrates with USB power protocols defined elsewhere in the USB and IEC portfolio.

Adoption of IEC 62680-1-5:2019 ensures USB audio devices meet global interoperability requirements and maintain high audio quality standards while supporting evolving USB technologies. Manufacturers and developers benefit from this comprehensive framework to deliver compatible and high-performance USB audio solutions.

Standards Content (Sample)

IEC 62680-1-5 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –
Part 1-5: Common components – USB Audio 3.0 device class definition

Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 1-5: Composants communs – Définition de classes de dispositifs USB
Audio 3.0
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IEC 62680-1-5 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –

Part 1-5: Common components – USB Audio 3.0 device class definition

Interfaces de bus universel en série pour les données et l'alimentation

électrique –
Partie 1-5: Composants communs – Définition de classes de dispositifs USB

Audio 3.0
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.20; 35.200; 29.200 ISBN 978-2-8322-7241-1

– 2 – IEC 62680-1-5:2019
© USB-IF:1997-2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 1-5: Common components – USB Audio 3.0 device class definition

FOREWORD
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International Standard IEC 62680-1-5 has been prepared by technical area 18: Multimedia
home systems and applications for end-user networks, of IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard was prepared by the USB Implementers Forum (USB-IF). The
structure and editorial rules used in this publication reflect the practice of the organization
which submitted it.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3157/CDV 100/3227/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
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The committee has decided that the contents of this document will remain unchanged until the
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© USB-IF:1997-2016
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by the USB
Implementers Forum (USB-IF). These specifications were submitted to the IEC under the auspices of
a special agreement between the IEC and the USB-IF.
This standard is the USB-IF publication USB Device Class Definition for Audio Devices Release 3.0.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group of
companies that developed the Universal Serial Bus specification. The USB-IF was formed to provide a
support organization and forum for the advancement and adoption of Universal Serial Bus technology.
The Forum facilitates the development of high-quality compatible USB peripherals (devices), and
promotes the benefits of USB and the quality of products that have passed compliance testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS", WITH NO WARRANTIES
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INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB IMPLEMENTERS
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Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

IEC– 65 268– 0-1-5:2019 – 5 –
© USB-IF:1997-2016
UNIVERSAL SERIAL BUS
DEVICE CLASS DEFINITION
FOR
AUDIO DEVICES
Release 3.0
September 22, 2016
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

– 6 – IEC 62680-1-5:2019
© USB-IF:1997-2016
SCOPE OF THIS RELEASE
This document is the Release 3.0 of this Device Class Definition.
CONTRIBUTORS
Joe Scanlon Advanced Micro Devices
Rhoads Hollowell Apple Inc.
Girault Jones Apple Inc.
Matthew X. Mora Apple Inc.
Tzung-Dar Tsai C-Media Electronics, Inc.
Brad Lambert Cirrus Logic, Inc.
Dan Bogard Conexant Systems, Inc.
Pete Burgers DisplayLink (UK), Ltd.
David Roh Dolby Laboratories, Inc.
Leng Ooi Google, Inc.
Pierre-Louis Bossart Intel Corporation
David Hines Intel Corporation
Abdul Rahman Ismail (Co-Chair) Intel Corporation
Devon Worrell Intel Corporation
Chandrashekhar Rao Logitech, Inc.
Terry Moore MCCI Corporation
Alex Lin MediaTek, Inc.
Bala Sivakumar Microsoft Corporation
Geert Knapen (Co-Chair & Editor) NXP Semiconductors
PL Mobile Audio
411 E. Plumeria drive
San Jose, CA 95134, USA
E-mail: [e-mail]
James Goel Qualcomm, Inc.
Andre Schevciw Qualcomm, Inc.
Jin-Sheng Wang Qualcomm, Inc.
Morten Christiansen Synopsys
REVISION HISTORY
Revision Date Filename Description
1.0 Mar. 18, 98 Audio10.pdf Release 1.0
2.0 May. 31, 06 Audio20 final.pdf Release 2.0
3.0 Sep. 22, 16 Audio30.pdf Release 3.0

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© USB-IF:1997-2016
Copyright © 1997-2016 USB Implementers Forum, Inc.
All rights reserved.
INTELLECTUAL PROPERTY DISCLAIMER
A LICENSE IS HEREBY GRANTED TO REPRODUCE THIS SPECIFICATION FOR INTERNAL USE ONLY. NO OTHER
LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, IS GRANTED OR INTENDED HEREBY.
USB-IF AND THE AUTHORS OF THIS SPECIFICATION EXPRESSLY DISCLAIM ALL LIABILITY FOR INFRINGEMENT OF
INTELLECTUAL PROPERTY RIGHTS RELATING TO IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION.
USB-IF AND THE AUTHORS OF THIS SPECIFICATION ALSO DO NOT WARRANT OR REPRESENT THAT SUCH
IMPLEMENTATION(S) WILL NOT INFRINGE THE INTELLECTUAL PROPERTY RIGHTS OF OTHERS.
THIS SPECIFICATION IS PROVIDED “AS IS” AND WITH NO WARRANTIES, EXPRESS OR IMPLIED, STATUTORY OR
OTHERWISE. ALL WARRANTIES ARE EXPRESSLY DISCLAIMED. USB-IF, ITS MEMBERS AND THE AUTHORS OF THIS
SPECIFICATION PROVIDE NO WARRANTY OF MERCHANTABILITY, NO WARRANTY OF NON-INFRINGEMENT, NO
WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, AND NO WARRANTY ARISING OUT OF ANY PROPOSAL,
SPECIFICATION, OR SAMPLE.
IN NO EVENT WILL USB-IF, MEMBERS OR THE AUTHORS BE LIABLE TO ANOTHER FOR THE COST OF PROCURING
SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA OR ANY INCIDENTAL,
CONSEQUENTIAL, INDIRECT, OR SPECIAL DAMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY, OR
OTHERWISE, ARISING IN ANY WAY OUT OF THE USE OF THIS SPECIFICATION, WHETHER OR NOT SUCH PARTY
HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
NOTE: VARIOUS USB-IF MEMBERS PARTICIPATED IN THE DRAFTING OF THIS SPECIFICATION. CERTAIN OF
THESE MEMBERS MAY HAVE DECLINED TO ENTER INTO A SPECIFIC AGREEMENT LICENSING INTELLECTUAL
PROPERTY RIGHTS THAT MAY BE INFRINGED IN THE IMPLEMENTATION OF THIS SPECIFICATION. PERSONS
IMPLEMENT THIS SPECIFICATION AT THEIR OWN RISK.
Dolby™, AC-3™, Pro Logic™ and Dolby Surround™ are trademarks of Dolby Laboratories, Inc.
All other product names are trademarks, registered trademarks, or service marks of their respective owners.
Please send comments via electronic mail to [e-mail]

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– 8 – IEC 62680-1-5:2019
© USB-IF:1997-2016
TABLE OF CONTENTS
Scope of This Release . 6
Contributors . 6
Revision History . 6
Table of Contents . 8
List of Tables . 12
List of Figures . 14
1 Introduction . 16
1.1 Scope . 16
1.2 Purpose . 16
1.3 Related Documents . 16
1.4 Terms and Abbreviations . 16
2 Management Overview. 19
2.1 Overview of Key Differences between ADC v2.0 and v3.0 . 19
3 Functional Characteristics . 21
3.1 Introduction . 21
3.2 Basic Audio Device Definition . 23
3.3 Backwards Compatibility . 23
3.4 Audio Interface Association (AIA) and Interface Association Descriptor . 23
3.4.1 Audio Function Class . 24
3.4.2 Audio Function Subclass . 24
3.4.3 Audio Function Protocol . 24
3.5 Audio Interface Class . 24
3.6 Audio Interface Subclass . 24
3.7 Audio Interface Protocol . 25
3.8 Audio Function Category . 25
3.9 Clock Domains . 26
3.10 Power Domains . 26
3.11 Audio Synchronization Types . 26
3.11.1 Asynchronous . 26
3.11.2 Synchronous . 26
3.11.3 Adaptive . 26
3.11.4 Implications of the Different Synchronization Types . 26
3.12 Inter Channel Synchronization . 28
3.13 Audio Function Topology . 28
3.13.1 Cluster . 33
3.13.2 Input Terminal . 33
3.13.3 Output Terminal . 34
3.13.4 Mixer Unit . 35
3.13.5 Selector Unit . 35
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IEC– 69 268– 0-1-5:2019 – 9 –
© USB-IF:1997-2016
3.13.6 Feature Unit . 36
3.13.7 Sampling Rate Converter Unit . 36
3.13.8 Effect Unit . 37
3.13.9 Processing Unit . 41
3.13.10 Extension Unit . 43
3.13.11 Clock Entities . 44
3.14 Operational Model . 45
3.14.1 AudioControl Interface . 46
3.14.2 AudioStreaming Interface . 47
3.14.3 Clock Model . 48
3.14.4 Power Domains Model . 48
3.14.5 Additional Power Considerations and Requirements . 50
3.14.6 Binding between Physical Buttons and Audio Controls . 50
4 Descriptors . 52
4.1 Standard Descriptors . 52
4.2 Class-Specific Descriptors . 52
4.2.1 Traditional Class-Specific Descriptors . 53
4.2.2 High Capability Class-Specific Descriptors . 53
4.3 Cluster Descriptor . 54
4.3.1 Cluster Descriptor Header . 55
4.3.2 Cluster Descriptor Block . 55
4.3.3 Example Cluster descriptor . 63
4.3.4 CEA-861.2 Channel Mapping . 64
4.4 Physical versus Logical Cluster . 65
4.4.1 Mapping between Physical and Logical Clusters . 65
4.5 AudioControl Interface Descriptors . 67
4.5.1 Standard AC Interface Descriptor. 67
4.5.2 Class-Specific AC Interface Descriptor . 68
4.6 AudioControl Endpoint Descriptors . 98
4.6.1 AC Control Endpoint Descriptors . 98
4.6.2 AC Interrupt Endpoint Descriptors . 98
4.7 AudioStreaming Interface Descriptors . 98
4.7.1 Standard AS Interface Descriptor . 99
4.7.2 Class-Specific AS Interface Descriptor . 99
4.7.3 Class-Specific AS Valid Frequency Range Descriptor . 100
4.8 AudioStreaming Endpoint Descriptors . 101
4.8.1 AS Isochronous Audio Data Endpoint Descriptors . 101
4.8.2 AS Isochronous Feedback Endpoint Descriptor . 102
4.9 Class-specific String descriptors . 103
5 Requests . 105
5.1 Standard Requests . 105
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– 10 – IEC 62680-1-5:2019
© USB-IF:1997-2016
5.2 Class-Specific Requests . 105
5.2.1 AudioControl Requests . 106
5.2.2 AudioStreaming Requests . 130
5.2.3 Additional Requests . 132
6 Interrupts . 135
6.1 Interrupt Data Message . 135
6.2 Interrupt Sources . 137
Appendix A. Audio Device Class Codes . 138
A.1 Audio Function Class Code . 138
A.2 Audio Function Subclass Codes . 138
A.3 Audio Function Protocol Codes . 138
A.4 Audio Interface Class Code. 138
A.5 Audio Interface Subclass Codes . 139
A.6 Audio Interface Protocol Codes . 139
A.7 Audio Function Category Codes . 139
A.8 Audio Class-Specific Descriptor Types . 140
A.9 Cluster Descriptor Subtypes . 140
A.10 Cluster Descriptor Segment types . 140
A.11 Channel Purpose Definitions . 141
A.12 Channel Relationship Definitions . 141
A.13 Ambisonic Component Ordering Convention Types . 143
A.14 Ambisonic Normalization Types . 143
A.15 Audio Class-Specific AC Interface Descriptor Subtypes. 144
A.16 Audio Class-Specific AS Interface Descriptor Subtypes . 144
A.17 Audio Class-Specific String descriptor Subtypes . 144
A.18 Extended Terminal Segment Types . 145
A.19 Effect Unit Effect Types . 145
A.20 Processing Unit Process Types . 145
A.21 Audio Class-Specific Endpoint Descriptor Subtypes . 146
A.22 Audio Class-Specific Request Codes . 146
A.23 Control Selector Codes . 146
A.23.1 AudioControl Interface Control Selectors . 146
A.23.2 Clock Source Control Selectors . 146
A.23.3 Clock Selector Control Selectors . 146
A.23.4 Clock Multiplier Control Selectors . 147
A.23.5 Terminal Control Selectors . 147
A.23.6 Mixer Control Selectors . 147
A.23.7 Selector Control Selectors . 147
A.23.8 Feature Unit Control Selectors . 148
A.23.9 Effect Unit Control Selectors . 148
A.23.10 Processing Unit Control Selectors . 150
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IEC– 611268 – 0-1-5:2019 – 11 –
© USB-IF:1997-2016
A.23.11 Extension Unit Control Selectors . 150
A.23.12 AudioStreaming Interface Control Selectors . 150
A.23.13 Endpoint Control Selectors . 151
A.24 Connector Types . 151

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– 12 – IEC 62680-1-5:2019
© USB-IF:1997-2016
LIST OF TABLES
Table 4-1: Traditional Class-Specific Descriptor Layout . 53
Table 4-2: High Capability Class-Specific Descriptor Layout . 54
Table 4-3: Cluster Descriptor Header . 55
Table 4-4: Cluster Descriptor Segment . 56
Table 4-5: End Segment . 57
Table 4-6: Cluster Description Segment . 57
Table 4-7: Vendor-defined Segment . 57
Table 4-8: Channel Relationships . 58
Table 4-9: Information Segment . 62
Table 4-10: Ambisonic Segment . 62
Table 4-11: Channel Description Segment . 63
Table 4-12: Vendor-defined Segment . 63
Table 4-13: Cluster Descriptor Example . 63
Table 4-14: Standard AC Interface Descriptor . 67
Table 4-15: Class-Specific AC Interface Header Descriptor . 68
Table 4-16: Input Terminal Descriptor . 70
Table 4-17: Output Terminal Descriptor . 71
Table 4-18: Extended Terminal Descriptor Header . 72
Table 4-19: Cluster Descriptor Segment . 73
Table 4-20: End Segment . 73
Table 4-21: Vendor-defined Segment . 74
Table 4-22: Bandwidth Segment . 74
Table 4-23: Magnitude Segment . 75
Table 4-24: Magnitude/Phase Segment . 75
Table 4-25: Position Segment . 76
Table 4-26: Position Segment . 76
Table 4-27: Vendor-defined Segment . 76
Table 4-28: Connectors Descriptor . 77
Table 4-29: Mixer Unit Descriptor . 81
Table 4-30: Selector Unit Descriptor . 82
Table 4-31: Feature Unit Descriptor . 83
Table 4-32: Sampling Rate Converter Unit Descriptor . 84
Table 4-33: Effect Unit Descriptor . 85
Table 4-34: Parametric Equalizer Section Effect Unit Descriptor . 86
Table 4-35: Reverberation Effect Unit Descriptor . 87
Table 4-36: Modulation Delay Effect Unit Descriptor . 88
Table 4-37: Dynamic Range Compressor Effect Unit Descriptor. 89
Table 4-38: Common Part of the Processing Unit Descriptor . 90
Table 4-39: Up/Down-mix Processing Unit Descriptor . 91
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IEC– 613268 – 0-1-5:2019 – 13 –
© USB-IF:1997-2016
Table 4-40: Stereo Extender Processing Unit Descriptor . 92
Table 4-41: Multi-Function Processing Unit Descriptor . 93
Table 4-42: Extension Unit Descriptor . 94
Table 4-43: Clock Source Descriptor . 95
Table 4-44: Clock Selector Descriptor . 96
Table 4-45: Clock Multiplier Descriptor . 96
Table 4-46: Power Domain Descriptor . 97
Table 4-47: Standard AC Interrupt Endpoint Descriptor . 98
Table 4-48: Standard AS Interface Descriptor . 99
Table 4-49: Class-Specific AS Interface Descriptor . 100
Table 4-50: Class-Specific AS Valid Frequency Range Descriptor . 100
Table 4-51: Standard AS Isochronous Audio Data Endpoint Descriptor . 101
Table 4-52: Class-Specific AS Isochronous Audio Data Endpoint Descriptor . 102
Table 4-53: Standard AS Isochronous Feedback Endpoint Descriptor . 103
Table 4-54: Class-specific String Descriptor . 104
Table 5-1: Request Layout . 107
Table 5-2: 1-byte Control CUR Parameter Block . 108
Table 5-3: 1-byte Control RANGE Parameter Block . 109
Table 5-4: 2-byte Control CUR Parameter Block . 109
Table 5-5: 2-byte Control RANGE Parameter Block . 109
Table 5-6: 4-byte Control CUR Parameter Block . 110
Table 5-7: 4-byte Control RANGE Parameter Block . 110
Table 5-8: INTEN Parameter Block . 110
Table 5-9: Insertion Control CUR Parameter Block . 113
Table 5-10: Band Numbers and Center
...