NielsMayer
Active Member
Looks like H3240 is the crystal oscillator.
Also given the sub circuit-board mounted onto the main circuit board, they are using some kind of standard USB->SPDIF converter (with a qualcomm 5128 for the Bluetooth. XMOS for the USB) and then just use a center-tapped transformer to generate the balanced output from an unbalanced input.
Note that better and more accurate converters will present with two crystal oscillators, one for 44.1K rates and their multiples, the other for 48K rates and their multiples.
Another thing to note is a lack of power-supply regulators -- that may be what is ultimately causing the jitter problems is power-supply noise coming from the computer.
Contrast with the complexity, usb-isolation and reclocking and multiple power supplies of the matrix xsdpdif-3 (which is ridiculously expensive, but very nice).
Also given the sub circuit-board mounted onto the main circuit board, they are using some kind of standard USB->SPDIF converter (with a qualcomm 5128 for the Bluetooth. XMOS for the USB) and then just use a center-tapped transformer to generate the balanced output from an unbalanced input.
Note that better and more accurate converters will present with two crystal oscillators, one for 44.1K rates and their multiples, the other for 48K rates and their multiples.
Another thing to note is a lack of power-supply regulators -- that may be what is ultimately causing the jitter problems is power-supply noise coming from the computer.
Contrast with the complexity, usb-isolation and reclocking and multiple power supplies of the matrix xsdpdif-3 (which is ridiculously expensive, but very nice).