For Sale a Singxer SU-1 USB Digital to Digital Converter.
Price: $150 shipped anywhere in the US.
New: They sell for $339
I used it primarily to take USB audio from a ShieldTV Pro and output Coax to a Headphone AMP/DAC for night-time listening.
USB2.0 input with XLR Balanced Output AES, Coaxial RCA and BNC, I2S and WCLK clock output.
Each output interface supports sampling rates:
44.1KHz, 48KHz, 88.2KHz, 96KHz,
176.4KHz, 192KHz, 352.8KHz, 384KHz
(I2S support all sampling rate,S/PDIF support upper to 192KHz
2.8 MHz (DSD64)-DoP, native
5.6 MHz (DSD128)-DoP, native
11.2 MHz (DSD256)-native
(I2S output support all DSD,S/PDIF,AES/EBU support DSD64 DOP mode)
the highest 32 bit over I2S output
The highest 24 bit over S/PDIF
Between these three links, you should be able to answer all of your technical questions.