General Description
The LM1208/LM1209 is a very high frequency video amplifier system intended for use in high resolution RGB monitor
applications. In addition to the three matched video amplifiers, the LM1208/LM1209 contains three gated single ended input black level clamp comparators for brightness control, three matched DC controlled attenuators for contrast
control, and three DC controlled drive attenuators providing
independent full range gain control in each channel for wide
range white balance. All DC control inputs offer high input
impedance and an operation range from 0V to 4V for easy
interface to bus controlled alignment systems. The
LM1208/LM1209 also contains a blanking circuit which
clamps the video output voltage during blanking to within
0.1V above ground. This feature provides 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 @ b3 dB
(4 VPP output)
Y Matched (g0.1 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 full range gain control (Drive) for each video channel (l40 dB range)
Y Spot killer, blanks outputs 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