An efficient power supply stage
Powered by a USB-C 5V input, the DAC has a particularly well-tuned power stage that allows both to ensure a stable signal while reducing sounds artefacts and noise.
For this, the PCB integrates a DC / DC converter from Mornsun followed by two LT7809/7909 linear regulators dedicated to the analog part, which is supplied with +/- 9V.
In addition, as for its predecessor, the Raspberry Pi is powered directly via the GPIO port, avoiding multiple connections.
The board includes 2 Ultra low noise voltage regulators dedicated to the DAC to isolate it from the main power supply.
DVCC is supplied with LP5907 (<6.5µV noise), which allow to internally generate the DAC 1.2V Vref which is a critical voltage.
AVCC is supplied with a dedicated ADP150 (< 9µV noise)