Nobsound U2 USB Converter XMOS XU208 Digital Interface TOSLINK COAX DSD 192KHz. This converter converts from microUSB to Toslink optical and coaxial. It is suitable for PC computers, notebooks, Android phones (OTG), set-top boxes, Rock 64, Raspberry Pi, etc. I purchased it with the intention of sending the DAC output to a Bluetooth transmitter, but I have not used it at all because I changed direction to use a separate analog-to-TOSLINK converter.