USB audio to I2S bridge 352/384 32

I wonder if Analog Devices provides an USB to I2S audio bridge? Either as one component or as a combination. It should handle USB 2, PCM 352/384 32 bit and DSD128 to PCM 176. On the other end there is a DSP (ADAU1467) running at 192/32. Audio direction is only from USB host to DSP. Since the DSP is running at 192, the bridge must be able to perform the sample rate conversion of the PCM stream down to 176/192.

I have done some searching and as far as I can see I will need to source the USB interface from other supplier but eventually there is some Analog Device solution that will be able to take care of the down sampling to match the sample rate of the DSP. Am I correct?

  • 0
    •  Analog Employees 
    on Mar 23, 2018 7:28 PM


    We are currently developing a new interface that will include of the functionality of (and improve on) the USBi, but it will also include bit-accurate, multi-channel audio I/O. It will be released this summer.

    Please see my PM for additional options for solutions.


  • Sounds great, any preliminary documentation for the updated USB interface?


  • 0
    •  Analog Employees 
    on Mar 24, 2018 1:37 AM

    No docs yet.

    These specs are preliminary and subject to change, but::

    • Support for USB 2 and USB 3 tested on Window 7 and Windows 10
    • USBi compatibility with all currently supported boards
    • 16 channels in / 16 channels out at 44.1/48 kHz
    • Bit-accurate I/O when using ASIO drivers with up to 32-bit data
    • 4 serial data lines in / 4 serial data lines out (e.g. 4x I2S for eight channels up to 1x TDM16)
    • Sample rates up 192 kHz (possibly 384 kHz) with reduced channel count
    • Fully programmable serial data formatting (I2S/LJ/RJ)
    • BCLK, LRCLK, and MCLK master or slave support
    • Level shifters to support targets down to 1.8V (possibly lower)
    • S/PDIF in/out on TOSLINK
    • A2B slave node support (for licensees)
    • ...and more to be announced


  • Hi Ken,

    this USB interface sounds very interesting to me and I would like to ask you if you can give me a quick update and maybe share documentation if available in the meantime?

    Thx, Markus

  • Any further info on specs and availability of this?