As [Jan-Erik] had already built a simple USB connected Digital-to-Analog Converter (DAC), he decided to make the high-end version of it.
The prototype you see in the picture above is based on:
- the PCM2707C from Texas Instruments which takes care of the USB communication and outputs I2S audio data
- the PCM1794A, a 132dB SNR 24-bit 192kHz DAC which receives I2S protocol
- the OPA4134, a high performance audio operational amplifier
The on-board +3.3V and -5V voltages are generated by inductor-less power supplies. As [Jan-Erik] mentions in his write-up, the ‘high-end’ was put between single quotes because the PCB is single sided and uses through hole passive components. The board was designed using Kicad, etched by himself and put in a machined enclosure. All the production files can be downloaded from his website so you may produce it within a day.