ABC PCB

The Edel USB to I2S/SPDIF interface is an easy to integrate OEM solution for High End USB audio playback systems, supporting both USB Audio Class 1.0 and 2.0.

Features

• USB 2.0 Full Speed compliant & USB Audio Class 1.0 or 2.0 supported (user selectable)
• 2-channel asynchronous endpoint for stereo jitter-free playback
• On board low jitter oscillators
• External master clock input
• Resolution up to 24-bits, sampling rate up to 192kHz (96kHz for USB Audio Class 1.0) I2S and S/PDIF output
• Full galvanic isolation
• Based on XMOS XS1-L1 controller/DSP in 128TQFP package and SMSC USB3318 USB PHY.

exaDevices

exaU2I Multichannel Asynchronous USB to I2S Interface - USD 430.00

Asynchronous operation is achieved by using fast FPGA control core, 256 kB FIFO memory buffer and proprietary ASIO driver.

Galvanic isolation of the I2S output from the FPGA core and the USB ground virtually eliminates jitter and common noise originated by the PC. Isolation is achieved by using Giant Magnetoresistive (GMR) Digital Isolators. The barrier capacitance between the board circuits and the I2S outputs is 17 pF.

The I2S output is powered by the external DAC power supply and it is completely independent from the USB power supplied to the board.

Two precision quartz oscillators allow very accurate clocking with minimum jitter for the 44.1 kHz and 48 kHz sample rate families.

Two voltage regulators with low-pass filters provide low-noise power to the FPGA core and the two precision quartz oscillators. This further minimizes jitter and noise.

Custom designed ASIO driver provides automatic sampling rate switching and bit-perfect data transfer. The exaU2I USB ASIO driver operates in asynchronous mode and it is completely independent from the Windows sound system

WDM / WASAPI support is available by using a third-party native Windows driver - Virtual Audio Cable.

XMOS XS1-L1 USB Audio 2.0 US$ 149.00

• USB endpoints use the asynchronous synchronization
• 500 MIPS, 8 threads, XS1-L1 processor
• 2 Channel analog input
• 2 Channel analog output
  
• USB 2.0 high speed interface - supports multiple 24 bit, 192kHz channels with extremely low latency (3ms round trip)
• Plug-and-play with Audio Class 2.0 enabled computers (native Mac OSX support, Thesycon Windows drivers available)
• Audio Class 1.0 compliant - native Mac OSX and Windows support
• Asynchronous clocking - complete control of the audio master clock

Basically a USB to I2S converter. Optional support for SPDIF/ADAT/MIDI

DSD: XMOS supports the open DSD standard.

A beta is available.

Rigisystems USBPAL

• Audio ASIO and WDM Interface for Microsoft Windows XP / Vista / W7 32/64bit
• PCM audio and DSD audio (8in, 8out)
• 44.1 - 384KHz (DxD) and 64x (2.8MHz) and 128x DSD (5.6MHz)
• Low latency kernel driver with integrated mixer
• Microsoft Windows 7, Vista, XP support
• Apple OS X support
• CoreAudio, ASIO 2.1 and WDM support

SOtM tx-USB US$ 300

A audiophile PCI to USB card with ultra low noise regulator for digital, clock, PLL and USB power circuit and ultra low jitter clock for USB clock.

Compliant with USB 2.0
All ports can handle high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps)
32-bit 33 MHz host interface compliant with PCI specification revision 2.2