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 clamping
system for both brightness control and video blanking.
The LM1204 also contains a back porch clamp pulse generator
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 video
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 interface
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 g3 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