USB 2.0 High-Speed Audio Junction Reference Design

Key Features

Hardware

• USB 2.0 High-Speed (480MHz) Audio / MIDI system
• Leading-edge performance technology based on an affordable, low-current chipset
• 32-bit audio processing with 4 input and 4 output channels
• Optionally up to 8 input and 8 output channels at max. 96kHz
• Optionally up to 16 input and 16 output channels at max. 48kHz
• Optionally ADAT output interface
• Samplerates: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz
• USB2.0 (3.0) bus- or self-powered power supply mode
• Sensationally low jitter (<10mUI) due to FMC™ (Fixed-Master-Clock) technology
• No samplerate conversion or clock recovery for true 1:1 audio
• Assignable stereo (1/4” TRS) line input and headphone output on the eval board
• Up to four MIDI input and output ports (fast USB2.0 I/O bulk transfer)
• Optional USB3.0 extension possible via companion chip
• Can be slaved to any I2S digital audio interface (CODEC or DIR/DIT as master)
• Based on the low cost (<EUR 2.00) 32-bit high performance Microchip® ATSAM3U1C microcontroller

Software

• Optional Apple MFi certification possible
• Multi-application mode - simultaneous ASIO and/or WDM playback
• Extremely low latency Windows ASIO and WDM driver (adjustable in multiple parameters)
• Default USB interrupt mode transactions on Windows for better performance
• Fully USB Audio Class 2.0 compliant (isoc asynchronous mode)
• Optionally compatible with the Windows 10 Fall Creators Update's Class 2.0 support
• Software installer and advanced ASIO control panel for Windows

Firmware

• Firmware updating via USB for programming future updates
• Handy 4x4 audiomixer in firmware (low latency monitoring)
• Direct USB2.0 tripple buffer capture and playback for lowest technically achievable latency
• Long term design experience with hundreds of thousands of USB Audio units licensed worldwide