"There are two versions.
The ladder network is designed as a current-output device. To obtain a voltage output requires an I/V converter.
The current output from the R2R ladder is directly available on one of the output pins. In this version the ladder is connected to an I/V converter having a extremely fast 1500V/µs slew rate and a bandwidth of 500MHz. This approach gives a very open detailed sound without the restrictions of commonly used silicon. In case of the voltage output, a passive 1st
-order network is added to the I/V converter with a -3dB point at 70kHz. This filter also creates an output impedance of 100Ω
in the audio band.
The EVA motherboard shown above right is made to evaluate the Dac One module in single-ended mode. By connecting a transformer having 2 x 10-12VAC windings. the board is ready for use. It can handle S/PDIF data up to 192kHz and several other data formats by removing three jumpers like RJ16, RJ24 and I²S. Core specs
are 16-bit resolution, max 1.5mA output current (current output version), 3V± max reference voltage for 2Vrms (voltage output version), -125dB noise relative to 2Vrms output (ma. digital input data) and -150dB @ 2Vrms for min. digital input data; 0.022% 2nd
-order THD at 44.1kHz and 0.0025% 3rd
-order THD with total power consumption of 91mW. More detailed information is available via firstname.lastname@example.org