CH C1 - SYNC_IO Board; BNC Clock Input

ANALOG_IN panel layout
3.3.6 SYNC_IO board
The SYNC_IO board is an optional clock synchronization board to be used with an external clock generator or together with other
CH products, such as the D1 SACD/CD unit. The board provides one clock input and two clock output on BNC connectors. Each VCXO
digital PLL (one is based on a 22.5792 MHz Masterclock and the other one on a 24.576 MHz Masterclock) of the C1 is capable of
frequency and phase locking. The frequency is tracked below 0.1 Hz with 0.1 PPM adjustments for optimal jitter rejection. When
fed with an audio Wordclock, the C1's internal clock will always keep a phase accuracy below 2.5 us (equivalent to sub-millimeter
position accuracy), thus enabling phase perfect match in a multichannel configuration. Following diagram shows the layout of the
back panel of the SYNC_IO board:
SYNC_IO board back panel layout
3.3.6.1 BNC clock input
The SYNC_IO board provides a BNC clock input that can be configured as 75 Ohm input impedance or high input impedance
through the C1's menu. Supported input frequencies on this connector are all standard audio Wordclocks (44.1, 48, 88.2, 96,
176.4 and 196 kHz), audio Masterclocks (22.5792 and 24.576 MHz), DSD bitclock (2.8224 MHz) and atomic-clock multiples (100
kHz and 10 MHz). Use this connector to synchronize your C1 unit to an external clock source (atomic clock generator or external
source such as CH D1).
24 C1 User Manual Rev 1.9