MSK621 View Datasheet(PDF) - M.S. Kennedy
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MSK621 Datasheet PDF : 6 Pages
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COMPLETE RGB VIDEO SYSTEM
A typical connection diagram for a red, green, blue video amplifier system is shown in Figure 2. To achieve optimum contrast
tracking, a master slave contrast connection is utilized. This is accomplished by connecting pins 2 and 3 of all three preamplifiers
together and using the contrast control of one channel to vary the contrast of all three channels simultaneously. White balance is
achieved through individual drive controls. Black level can also be adjusted for each channel by adjusting the voltage at pin 17. If
the cathode is AC coupled, the video signal is DC restored at the cathode. In that case black level clamping can be accomplished
by biasing pin 17 to the desired black level. Black level control is accomplished with R8 and R9 sampling the output and feeding
it back to the clamping section of the MSK 621. This scheme provides black level control superior to locally sampling the MSK 621
output and feeding that back to the clamping section.
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Rev. A 8/00
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