I sell this superb dCS Master Clock Puccini U-Clock, including an USB/SPDIF input.
It accepts any USB Audio format up to 24bits/96Khz. The U-Clock synchronize the USB and your DAC (if it has a WordClock input) The SPDIF connector is cinch RCA, and the WordClock is on BNC connector
Wonderful sound, more details, less digital sounding, and better image.
Type:System Clock Clock Frequencies:44.1kHz or 48kHz. Colour:Black. Clock Accuracy:Better than +/-1ppm when shipped over an ambient temperature range of 10°C to 30°C (guaranteed for 12 months from shipping). Typically +/-0.1ppm when shipped and stabilised. Word Clock Outputs:4 independently buffered outputs on 75Ω BNC connectors, all carry the same clock frequency. With the USB interface active at 32, 48, or 96kS/s, the Word Clock outputs are set to 48kHz. With the USB interface active at 44.1, 88.2kS/s, the Word Clock outputs are set to 44.1kHz. USB Auto Frequency mode can be disabled from the front panel. Digital Inputs:USB 2.0 interface on type B connector accepts uncompressed audio data at 32, 44.1, 48, 88.2, 96, 176.4 & 192kS/s plus DOP. Digital Outputs:Puccini U-Clock will present data received via the USB interface, unprocessed, in SPDIF format via 2 x RCA Phono connectors. DSD in DOP format will be passed through unchanged. Operating Systems:Tested on Windows XP/Vista/7 and Mac OSX. Operates in ‘Audio Class’ mode. Class 1 mode (limited to 96kS/s) is available and does not require special drivers to be installed. Class 2 mode requires the dCS drivers (supplied) to be installed on Windows PCs. Not required for OSX 10.6.3 or later. File Formats:Packetised PCM at 32, 44.1, 48, 88.2, 176.4 & 192kS/s. Start Up Time:Typically 1 minute to rated accuracy. Power Supply:Factory set for 100, 115, 220 or 230V AC, 49-62Hz. Power Consumption:3 Watts typical/6 Watts maximum. Gewicht:7,6kgBreedte:460 mm Hoogte:58 mm