Today we had a look at the noise and distortions of the HiFiBerry DSP light. They look promising. Noise is not a problem at all – which is not the case for every DSP that is available on the market. The distortion figures are a bit above the typical distortions from the datasheet, but still at an acceptable level below 0.01%. The low noise figures show, that the PCB design works well with its clear separation of the analog and the digital part of the circuit.
Note that these figures are measured with a very cheap power supply and the Raspberry Pi connected to the DSP and running. That means all major noise sources, except the Ethernet port, are already included in this measurement.