LM1205/LM1207
130 MHz/85 MHz RGB Video Amplifier System with
Blanking
General Description
The LM1205/LM1207 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/LM1207 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/LM1207 also contains a
blanking circuit which clamps the video output voltage during
blanking to within 0.1V above ground. This feature provides
blanking capability at the cathodes of the CRT. A spot
killer is provided for CRT phosphor protection during powerdown.
Features
Y Three wideband video amplifiers 130 MHz (LM1205) @
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 0V to 4V, high input impedance DC contrast control
(l40 dB range)
Y 0V to 4V, high input impedance DC drive control for
each video amplifier (b6 dB to 0 dB range)
Y Spot killer, blanks output when VCC k 10.6V
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