LM1204 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – 150 MHz RGB Video Amplifier System

December 1994
LM1204 150 MHz RGB Video Amplifier System
General Description
The LM1204 is a triple 150 MHz video amplifier system
designed specifically for high resolution RGB video display
applications In addition to three matched video amplifiers
the LM1204 contains a DC operated contrast control a DC
operated drive control for each amplifier and a dual clamp-
ing system for both brightness control and video blanking
The LM1204 also contains a back porch clamp pulse gener-
ator which is activated by an externally supplied gH HV
sync signal or by an external composite video signal The
gH HV sync input will have priority over the composite vid-
eo input A single bH HV sync output is provided for the
automatically selected sync input signal The back porch
clamp pulse width is user adjustable from 0 3 ms to 4 ms
The LM1204 video output stage will directly drive most
Hybrid or discrete CRT amplfier input stages without the
need for an external buffer transistor The device has been
designed to operate from a 12V supply with all DC controls
operating over a 0V to 4V range providing for an easy inter-
face to serial digital buss controlled monitors
Features
Y _{Built-in video blanking function}
Y _{Built-in sync separator for composite video input}
Y _{Includes DC restoration of video signals}
Y _{Back porch clamp pulse width user adjustable}
Y _{DC control of brightness contrast blanking level drive}
and cutoff
Y _{DC controls are 0V to 4V for easy interfacing to a}
digitally controlled system
Key Specifications
Y _{150 MHz large signal bandwidth (typ)}
Y _{2 3 ns rise fall times (typ)}
Y _{0 1 dB contrast tracking (typ)}
Y g_{3 dB drive (D gain) adjustments on R G B channels}
(typ)
Applications
Y _{High resolution CRT monitors}
Y _{Video AGC amplifier}
Y _{Wideband amplifier with gain and DC offset control}
Block Diagram and Connection Diagram
Top View
C1995 National Semiconductor Corporation TL H 11238
Ordering Information
Order Number LM1204V
See NS Package Number V44A
TL H 11238 – 1
RRD-B30M115 Printed in U S A