LM1205
130 MHz RGB Video Amplifier System with Blanking
General Description
The LM1205 is a very high frequency video amplifier system
intended for use in high resolution RGB monitor applications.
In addition to the three matched video amplifiers, the
LM1205 contains three gated single ended input black level
clamp comparators for brightness control, three matched
DC controlled attenuators for contrast control, and three DC
controlled sub-contrast attenuators providing gain trim capability
for white balance. All DC control inputs offer high
input impedance and an operation range from 0V to 4V for
easy interface to bus controlled alignment systems. The
LM1205 also contains a blanking circuit which clamps the
video output voltage during blanking to within 0.1V of
ground. This feature provides blanking capability at the
cathode of the CRT.
Features
Y Three wideband video amplifiers 130 MHz @ b3 dB
(4 VPP output)
Y Matched (g0.1 dB or 1.2%) attenuators for contrast
control
Y Three externally gated single ended input comparators
for cutoff and brightness control
Y Provisions for individual gain control (Drive) of each
video amplifier
Y 0V to 4V, high input impedance DC contrast control
(l40 dB range)
Y 0V to 4V, high input impedance DC drive control
(g3 dB range)
Y Capable of 7 VPP output swing (slight reduction in
bandwidth)
Y Output stage blanking
Y Output stage directly drives most hybrid or discrete
CRT drivers
Applications
Y High resolution RGB CRT monitors
Y Video AGC amplifiers
Y Wideband amplifiers with gain and DC offset controls
Y Interface amplifiers for LCD or CCD systems