they simply require you to initialize with a 16 bit value, then you stream binary data which is directly converted... it requires programming, but if you want to squeeze anything out of a raspberry pi, you have no choice anyway, as most of the GUI will freeze it as soon as you open a window...
this is some live experience from an attempt to use an existing linux distribution with it...
you would have to develop something yourself from a lightweight and optimized distro, avoiding graphical mode... but you can easily read data from ethernet, decode bit streams, and send them to the DACs if you know C++ and linux