DCS Vivaldi DAC - Rear Panel Connections Part 3; Word Clock Inputs and Output

dCS Vivaldi DAC User Manual Software Issue 2.0x
November 2016
Vivaldi DAC Manual v2_0x Page 26 English version
Word Clock Inputs and Output
Each of the three Word Clock In connectors (R) will accept standard word clock from the source
equipment or a master clock at 32, 44.1, 48, 88.2, 96, 176.4 or 192kHz. The clock frequency MUST be
an exact multiple of the data rate, otherwise the system will not lock. Use the Settings > Sync mode
menu page to lock the selected input to the selected external word clock. The source MUST be locked
to the same clock, otherwise the system will not be locked and periodic clicks or other undesirable
noises or dropouts will be heard on the outputs.
Each of the Word Clock Inputs may be used individually, but to make operation easier, the Vivaldi
DAC’s Sync mode menu page features an Auto mode. In this mode you can connect a 44.1, 88.2 or
176.4kHz word clock to Word Clock In1 and a 48, 96 or 192kHz word clock to Word Clock In2. With
a source connected to another feed from the same Clock, the DAC can select the correct clock
frequency.
Word Clock In3 is primarily intended to be connected to the Upsampler’s Word Clock Output to
improve performance with sources that do not have a Word Clock input.
When the unit is set to Master mode, the DAC uses its internal clock instead of locking to the data or
one of the Word Clock Inputs, then the Word Clock Out connector (S) carries a word clock at the
same rate as the single-wire input rate. This MUST be connected to the source equipment, so that the
system can lock.
Word clock is used for synchronisation only, it does not carry digital data.
Test interface
The Test interface (U) is an RS232 interface two modes, set by the Settings > RS232 menu page.
• Binary mode is used to remotely control the unit during automated production testing at dCS.
• Text mode is for use with a household automation system. If you would like to use this mode,
please download the list of remote control commands from www.dcsltd.co.uk.
The interface is designed to be used with a “straight through” cable, wired pin 1 to pin 1, etc.
The pin connections are:
• Pin 2 – dCS unit transmit
• Pin 3 – dCS unit receive
• Pin 5 – ground
• Shell – cable screen & drain wire
Mains inlet
Power is connected via a standard IEC320 connector (V), protected by a fuse and isolated by a 2-pole
power switch.
Label
The label (W) states the unit’s serial number and the nominal voltage to which the unit is set. It is
important to quote the serial number if you need assistance.