USB Type-C Audio Adapter Accessory Mode Reference Design


Design files


The USB Type-C™ audio adapter accessory mode reference design provides the solution for transmitting analog audio through the USB Type-C interface.  This reference design demonstrates how analog audio can be transmitted to system peripherals using the USB Type-C standard audio adapter accessory mode, while still maintaining the ability to transfer USB data over the same USB Type-C connector.

  • Supports analog audio through USB Type-C connector
  • Low total harmonic distortion (THD) = <-85 dB (0.005%) at 1 Vpp
  • Replaces large 3.5-mm audio jack with smaller Type-C connector
  • Protects microcontrollers from negative voltage swings from analog audio
  • Supports USB Power Delivery

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUB66.PDF (2784 K)

Reference design overview and verified performance test data

TIDRM76.ZIP (453 K)

Detailed schematic diagram for design layout and components

TIDRM77.ZIP (179 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRM75.ZIP (182 K)

Detailed overview of design layout for component placement

TIDRM78.ZIP (1719 K)

Files used for 3D models or 2D drawings of IC components

TIDCCA3.ZIP (2287 K)

Design file that contains information on physical board layer of design PCB

TIDRM79.ZIP (1208 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

USB redrivers & multiplexers

TS5USBA224USB 2.0 High-Speed (480Mbps) and Audio Switches with Negative Signal Capability

Data sheet: PDF
Audio switches

TS3A227E60-mΩ, 4.5-V, autonomous audio accessory detection & configuration switch with I2C

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS54335-1A4.5V to 28V Input, 3A, Synchronous, Step-Down Converter with Eco-mode in alternative DRC package

Data sheet: PDF | HTML
ESD protection diodes

TPD4E05U06Quad 0.5-pF, 5.5-V, ±12-kV ESD protection diode for USB, HDMI & High Speed Interfaces

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17309Q330-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.3 mOhm

Data sheet: PDF | HTML
USB Type-C & USB Power Delivery ICs

TPS65982USB Type-C™ and USB PD controller power switch and high-speed multiplexer

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide USB Type-C Audio Adapter Accessory Mode Design Guide Dec. 01, 2015
Technical article USB Type-C audio: Do I need to buy a new pair of headphones? PDF | HTML Jul. 07, 2016

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