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