LM1204V
150 MHz RGB Video Amplifier System
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
Built-in video blanking function
Built-in sync separator for composite video input
Includes DC restoration of video signals
Back porch clamp pulse width user adjustable
DC control of brightness, contrast, blanking level, drive
and cutoff
DC controls are 0V to 4V for easy interfacing to a
digitally controlled system
Key Specifications
150 MHz large signal bandwidth (typ)
2.3 ns rise/fall times (typ)
0.1 dB contrast tracking (typ)
g3 dB drive (D gain) adjustments on R, G, B channels
(typ)
Applications
High resolution CRT monitors
Video AGC amplifier
Wideband amplifier with gain and DC offset control
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