An efficient power supply stage
Powered via a 5V Micro USB input, the DAC has a particularly well-designed power supply stage that ensures a stable signal while reducing residual noise. For this purpose, the PCB integrates a Mornsun DC/DC converter, followed by two LT7809/7909 linear controllers dedicated to the analog part, which is supplied with +/-9V.
In addition, as with its predecessor, the Raspberry Pi is powered directly via the GPIO port, thus avoiding multiple connections.
The board also has two ultra-low noise voltage regulators dedicated to the DAC to isolate it from the main power supply. The DVCC voltage is generated from an LP5907 (regulation <6.5µV), which generates the Vref 1.2V of the DAC, which is a critical voltage. The AVCC voltage is generated from a dedicated ADP150 regulator (regulation <9µV).