LM1282 National Semiconductor, LM1282 Datasheet

LM1282

Manufacturer Part Number

LM1282

Description

110 MHz RGB Video Amplifier System with On Screen Display (OSD)

Manufacturer

National Semiconductor

Datasheet

1.LM1282.pdf (14 pages)

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LM1282

110 MHz RGB Video Amplifier System with On Screen

Display (OSD)

General Description

The LM1282 is a full feature video amplifier with OSD inputs,

all within a 28-pin package. This part is intended for use in

monitors with resolutions up to 1280 x 1024. The video sec-

tion of the LM1282 features three matched video amplifiers

with blanking. All of the video amplifier adjustments feature

high input impedance 0V to 4V DC controls, providing easy

interfacing to bus controlled alignment systems. The OSD

section features three TTL inputs and a DC contrast control.

The switching between the OSD and video section is con-

trolled by a single TTL input. Although the OSD signals are

TTL inputs, these signals are internally processed to match

the OSD logic low level to the video black level. When ad-

justing the drive controls for color balance of the video sig-

nal, the color balance of the OSD display will track these

color adjustments. The LM1282 also features an internal

spot killer circuit to protect the CRT when the monitor is

turned off. For applications without OSD insertion please re-

fer to the LM1205 or LM1208 data sheets.

Features

n Three wideband video amplifiers 110 MHz

Block and Connection Diagram

(4 V

output)

DS012519

FIGURE 1. Order Number LM1282N

See NS Package Number N28B

−3 dB

n TTL OSD inputs, 50 MHz bandwidth

n On chip blanking, outputs under 0.1 V when blanked

n High speed Video/OSD switch

n Independent drive control for each channel for color

n 0V to 4V, high impedance DC contrast control with over

n 0V to 4V, high impedance DC drive control (0 dB to

n 0V to 4V, high impedance DC OSD contrast control with

n Capable of 7 V

n Output stage directly drives most hybrid or discrete CRT

Applications

n High resolution RGB CRT monitors requiring OSD

balance

40 dB range

−12 dB range)

over 40 dB range

bandwidth)

drivers

capability

output swing (slight reduction in

www.national.com

DS012519-1

June 1998

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