Changing USB input on DAC to Coax SPDIF?

The Isis is the same design as the Saturn R, the only digital input is USB. Does the Raspberry Pi require the Rega driver installed on it? I'm looking at simple streaming options like an Ifi Zen Stream vs a laptop. I want to stream from a hard drive with ripped CDs from a devise that is simple and avoids most of the computer noise issues. A computer requires a driver installed to work, will the Ifi work through the USB connection?

@jaytor The need for the USB driver on a laptop is the issue that confuses me. Doesn't the driver help the computer recognize and function with the DAC? But why does a streamer like say the Ifi Stream not require a driver to do the same thing? Is there a universal standard between audio devices that is missing on computers? Just trying to understand because my first idea was to replace the USB input with a COAX input.