LM1205 National Semiconductor, LM1205 Datasheet

LM1205

Manufacturer Part Number

LM1205

Description

130 MHz/85 MHz RGB Video Amplifier System with Blanking

Manufacturer

National Semiconductor

Datasheet

1.LM1205.pdf (24 pages)

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C 1996 National Semiconductor Corporation

LM1205 LM1207

130 MHz 85 MHz RGB Video Amplifier System with

Blanking

General Description

The LM1205 LM1207 is a very high frequency video amplifi-

er system intended for use in high resolution RGB monitor

applications In addition to the three matched video amplifi-

ers the LM1205 LM1207 contains three gated single end-

ed input black level clamp comparators for brightness con-

trol 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 LM1205 LM1207 also contains a

blanking circuit which clamps the video output voltage dur-

ing blanking to within 0 1V above ground This feature pro-

vides blanking capability at the cathodes of the CRT A spot

killer is provided for CRT phosphor protection during power-

down

Features

Block and Connection Diagram

Three wideband video amplifiers 130 MHz (LM1205)

Matched (

control

3 dB (4 V

0 1 dB or 1 2%) attenuators for contrast

output)

TL H 11881

Order Number LM1205N or LM1207N

See NS Package Number N28B

FIGURE 1

Applications

Three externally gated single ended input comparators

for cutoff and brightness control

0V to 4V high input impedance DC contrast control

(

0V to 4V high input impedance DC drive control for

each video amplifier (

Spot killer blanks output when V

Capable of 7 V

bandwidth)

Output stage blanking

Output stage directly drives most hybrid or discrete

CRT drivers

High resolution RGB CRT monitors

Video AGC amplifiers

Wideband amplifiers with gain and DC offset controls

Interface amplifiers for LCD or CCD systems

40 dB range)

RRD-B30M66 Printed in U S A

output swing (slight reduction in

6 dB to 0 dB range)

CC k

10 6V

TL H 11881 – 1

January 1996

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