The UPS guy just dropped off my brand new Soekris R-2R DAC:
Also known by the very bland designation “DAM1021”.
It is a sign-magnitude R-2R DAC (a.k.a. “ladder” DAC), meaning that it is quite different in operation than the regular run-of-the-mill DACs.
It is more like a PCM1704-based DAC but with 192KHz+ support plus a bunch of high tech goodies, such as a built-in FIFO buffer.
It is available in three versions, with resistors of different tolerances (0,01% (high grade), 0,02% (mid), 0,05% (basic)). I got my hands on the 0,02% version.
It has three inputs:
1) I2S (electrically isolated)
2) Coax s/pdif
3) TTL for a Toslink receiver
It is powered directly by a 2 x 7-8V transformer, but may be powered by a bipolar DC power supply.
It outputs a single ended signal at 1.4V RMS and also has a buffer for balanced output at 4V RMS.
It has a serial port for firmware upgrades as well as control.
I have already began work on a Soekris R-2R version of my TFT HiFiDuino Arduino code, tailored to controlling this particular DAC via its serial port.
The board will of course get its own page pretty soon.. Edit: the board now has a page.
To do: hook the board up and actually listen to it play. Stay tuned.