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LM1207A データシート(PDF) 2 Page - Texas Instruments

部品番号 LM1207A
部品情報  130 MHz/85 MHz RGB Video Amplifier System with Blanking
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LM1205A/LM1207A
130 MHz/85 MHz RGB Video Amplifier System with
Blanking
General Description
The LM1205A/LM1207A is a very high frequency video am-
plifier system intended for use in high resolution RGB moni-
tor applications. In addition to the three matched video am-
plifiers, the LM1205A/LM1207A 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 sub-contrast attenuators
providing gain trim capability for white balance. All DC con-
trol inputs offer high input impedance and an operation
range from 0V to 4V for easy interface to bus controlled
alignment systems. The LM1205A/LM1207A 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
n
Three wideband video amplifiers 130 MHz (LM1205A) @
−3 dB (4 V
PP output)
n
Matched (±0.1 dB or 1.2%) attenuators for contrast
control
n
ESD susceptibility above 3 kV
n
Three externally gated single ended input comparators
for cutoff and brightness control
n
0V to 4V, high input impedance DC contrast control
(>40 dB range)
n
0V to 4V, high input impedance DC drive control for
each video amplifier (−6 dB to 0 dB range)
n
Spot killer, blanks output when V
CC < 10.6V
n
Capable of 7 V
PP output swing (slight reduction in
bandwidth)
n
Output stage blanking
n
Output stage directly drives most hybrid or discrete CRT
drivers
Applications
n
High resolution RGB CRT monitors
n
Video AGC amplifiers
n
Wideband amplifiers with gain and DC offset controls
n
Interface amplifiers for LCD or CCD systems
Block and Connection Diagram
DS012866-1
FIGURE 1.
Order Number LM1205AN or LM1207AN, See NS Package Number N28B
August 1996
© 1997 National Semiconductor Corporation
DS012866
www.national.com


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