Sierra Video 507109-00 - Manual (Page 2)

Composite to 270Mbps Video Converter User’s Guide 2
Introduction
The Composite Video to 270Mbps Digital Video Converter accepts analog composite video signals
compatible with US NTSC, Japanese NTSC, std. PAL and PAL-M standards. The incoming signal is
digitized and decoded into a component video signal in the digital domain. The resulting digital component
signal is then passed through a user adjustable blanking circuit which allows cropping of noise along the
left, right, and top of the raster. The resulting signal is then converted into a SMPTE 259 compliant serial
stream and buffered to provide two serial digital component video signals via rear panel BNC connectors.
The amplitude of the analog input signal is adjustable over a +/- 20% range using trimDAC’s; allowing
local and remote control of a traditionally analog adjustment. Pedestal offset is automatically corrected to
track gain changes, but can be adjusted by the user to correct for non-standard sources. An internal ‘clean
up’ PLL keeps serial video phase noise low, even with imperfect video sources. SmartLinx functionality
allows all module controls to be accessed remotely via SVS control panels or a Windows 95/98/NT PC.
Peripheral Connections
The rear panel provides the following signal connections to the user:
COMPOSITE VID. IN - These two BNC connectors serve as the analog composite video signal
inputs to the product. Two are provided to allow the user to ‘loop through’ the source. The
unused input must be terminated in 75 Ohms. Signals applied here are fed to the digitizer and to
the clock generation circuitry for the module.
DIG. VID. OUT - These two BNC connectors provide serial digital component video signal outputs
from the product. They are copies of one another and either may be used without affecting the
other.