: This is a low-profile unit placed inside an aluminum enclosure with a thick front where we have two buttons, one for powering the unit, the other to switch on the LEDs. There is an input selector with indicators and a blue LED indicating sync with the drive. I missed an indicator for input signal parameters. On the back we have S/PDIF, TOSLINK and USB input sockets and the RCA analog outputs. Inside we have a small toroidal transformer, the USB input and digital receiver board and the main conversion board.
The CS8416 is the main receiver/decoder for the S/PDIF signal. The USB port allows streaming music from a computer and the USB signal is converted to S/PDIF and processed by the CS8416 just like the other inputs. After connecting the unit to the computer, the “USB audio device” gets installed and the USB interface is powered from the computer. The USB input is limited to a max sampling frequency of 48kHz by the chosen input chip. All inputs including USB are galvanically isolated from the signal source. The logic of the receiver mutes the signal in case of S/PDIF receiver errors or if the signal is not an audio signal. The PLL generator power supply inside the CS8416 has a separate stabilizer to minimize jitter.