USB Type-C Audio Adapter Accessory Mode Reference Design
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Key Document


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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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17309Q3  30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.3 mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
TPD4E05U06  Quad 0.5-pF, 5.5-V, ±12-kV ESD protection diode for USB, HDMI & High Speed Interfaces  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
TPS54335-1A  4.5V to 28V Input, 3A, Synchronous, Step-Down Converter with Eco-mode in alternative DRC package  Step-down (buck) regulators  Sample & Buy Not Available
TPS65982  USB Type-C™ and USB PD controller power switch and high-speed multiplexer  USB ICs  Sample & Buy View Design Kits & Evaluation Modules
TS3A227E  60-mΩ, 4.5-V, autonomous audio accessory detection & configuration switch with I2C  Audio interface ICs  Sample & Buy View Design Kits & Evaluation Modules
TS5USBA224  USB 2.0 High-Speed (480Mbps) and Audio Switches with Negative Signal Capability  USB ICs  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17309Q3 VSON-CLIP (DQG)| 8 Download Download
TPD4E05U06 Download Download
TPS65982 Download
(ZQZ) | 96 Download -
TS3A227E Download
TS5USBA224 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2784 01 Dec 2015
Design files (6)
Title Type Size (KB) Date
ZIP 1208 09 Jun 2016
ZIP 2287 09 Jun 2016
ZIP 1719 09 Jun 2016
ZIP 179 09 Jun 2016
ZIP 453 09 Jun 2016
ZIP 182 09 Jun 2016

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