LM1205 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – 130 MHz/85 MHz RGB Video Amplifier System with Blanking

January 1996
LM1205 LM1207
130 MHz 85 MHz RGB Video Amplifier System with
Blanking
General Description
The LM1205 LM1207 is a very high frequency video amplifi-
er system intended for use in high resolution RGB monitor
applications In addition to the three matched video amplifi-
ers the LM1205 LM1207 contains three gated single end-
ed input black level clamp comparators for brightness con-
trol three matched DC controlled attenuators for contrast
control and three DC controlled sub-contrast attenuators
providing gain trim capability for white balance All DC con-
trol 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 dur-
ing blanking to within 0 1V above ground This feature pro-
vides blanking capability at the cathodes of the CRT A spot
killer is provided for CRT phosphor protection during power-
down
Features
Y _{Three wideband video amplifiers 130 MHz (LM1205)}
b3 dB (4 V_PP output)
Y _{Matched (}g_{0 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}
Block and Connection Diagram
C1996 National Semiconductor Corporation TL H 11881
FIGURE 1
Order Number LM1205N or LM1207N
See NS Package Number N28B
RRD-B30M66 Printed in U S A
TL H 11881 – 1