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LM1212 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – 230 MHz Video Amplifier System with OSD Blanking
August 1996
LM1212
230 MHz Video Amplifier System with OSD Blanking
General Description
The LM1212 is a very high frequency video amplifier system
intended for use in high resolution monochrome or RGB
color monitor applications with OSD In addition to the wide-
band video amplifier the LM1212 contains a gated differen-
tial input black level clamp comparator for brightness con-
trol a DC controlled attenuator for contrast control and a
DC controlled sub contrast attenuator for drive control The
DC control for the contrast attenuator is pinned out sepa-
rately to provide a more accurate control system for RGB
color monitor applications All DC controls offer a high input
impedance and operate over a 0V–4V range for easy inter-
face to bus controlled alignment systems During the OSD
window the output is blanked to k 0 4V The LM1212 oper-
ates from a nominal 12V supply but can be operated with
supply voltages down to 8V for applications that require re-
duced IC package power dissipation characteristics
Features
Y Wideband video amplifier
(fb3 dB e 230 MHz at VO e 4 VPP)
Y tr tf e 1 5 ns at VO e 4 VPP
Y Externally gated comparator for brightness control
Y 0V to 4V high input impedance DC contrast control
(l 40 dB range)
Y 0V to 4V high input impedance DC drive control
(g3 dB range)
Y Ouput blanked to k 0 4V for OSD window
Y Easy to parallel three LM1212s for optimum color
tracking in RGB systems
Y Output stage clamps to 0 65V and provides up to 9V
output voltage swing
Y Output stage directly drives most hybrid or discrete
CRT amplifier stages
Applications
Y High resolution CRT monitors with OSD
Y Video switches
Y Video AGC amplifier
Y Wideband amplifier with gain and DC offset control
Block and Connection Diagram
Order Number LM1212N
See NS Package Number N20A
TL H 12354 – 1
C1996 National Semiconductor Corporation TL H 12354
RRD-B30M86 Printed in U S A
http www national com
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