B.3.10 External Sync Input Option Card
The External Sync Option card provides a means of inputting a system reference
either from an external, 10 MHz clock or analog video source. Only one reference
source may be connected at any time, and the single BNC connector caters for
either input signal type.
Table B.19 External Sync Input Specification
Item Specification
Safety Status SELV
Connector Designation SYNC IN
Connector Type 75 Ω BNC
Input Impedance:
(Resistive termination)
75 Ω
Input (Analog Video)
The input is capable of accepting a wide range of analogue video input voltage
levels and is also capable of accepting various color standards. Requirements for
the video input signal are defined in the following table.
Table B.20 External Sync Input (Analog Video) Specification
Item Specification
Nominal Video level:
(AC Coupled)
0.5 to 2.0 Volts peak-to-peak
Applicable Video Standards: PAL, NTSC
Input Video Interfaces:
Composite (CVBS), S-Video (Y/C), and Component Video
(YPBPR/GBR)
Chroma Filter Always present
Input (10 MHz Reference)
A 10 MHz input can be applied via the BNC connector which may be sinusoidal or
square in shape. The required characteristics for the input signal are defined in the
following table.
Table B.21 External Sync Input (10 MHz Reference) Specification
Item Specification
Input Level (AC Coupled) 1 Volt peak-to-peak
Input waveform: Sinusoidal or Square
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