LM1247EBW-NA National Semiconductor, LM1247EBW-NA Datasheet

LM1247EBW-NA

Manufacturer Part Number

LM1247EBW-NA

Description

Manufacturer

National Semiconductor

Datasheet

1.LM1247EBW-NA.pdf (48 pages)

Specifications of LM1247EBW-NA

Case

DIP

Date_code

2003

Current page: 1 of 48
Download datasheet (4Mb)

LM1247

150 MHz I

512 Character OSD ROM, 512 Character RAM and 4

DACs

General Description

The LM1247 pre-amp is an integrated CMOS CRT preamp.

It has an I

the parameters necessary to directly setup and adjust the

gain and contrast in the CRT display. Brightness and bias

can be controlled through the DAC outputs which are well

matched to the LM2479 and LM2480 integrated bias clamp

ICs. The LM1247 preamp is also designed to be compatible

with the LM246x high gain driver family.

Black level clamping of the video signal is carried out directly

on the AC coupled input signal into the high impedance

preamplifier input, thus eliminating the need for additional

clamp capacitors. Horizontal and vertical blanking of the

outputs is provided. Vertical blanking is optional and its

duration is register programmable.

The IC is packaged in an industry standard 24 lead DIP

molded plastic package.

Features

n Internal 512 character OSD ROM usable as either (a)

n Internal 512 character RAM, which can be displayed as

Internal Block Diagram

384 2-color plus 128 4-color characters, (b) 640 2-color

characters, or (c) some combination in between

one single or two independent windows

C compatible interface which allows control of all

C Compatible RGB Preamplifier with Internal

FIGURE 1. Order Number LM1247AAG/NA

DS200484

See NS Package Number N24D

n I

n OSD override allows OSD messages to override video

n 4 DAC outputs (8-bit resolution) for bus controlled CRT

n Spot killer which blanks the video outputs when V

n Suitable for use with discrete or integrated clamp, with

n Horizontal blanking and OSD synchronization directly

n Vertical blanking and OSD synchronization directly from

n Power Saving Mode with 65% power reduction

n Matched to LM246x driver and LM2479/80 bias IC’s

Applications

n Low end 15" and 17" bus controlled monitors with OSD

n 1024x768 displays up to 85 Hz requiring OSD capability

n Very low cost systems with LM246x driver

and the use of burn-in screens with no video input

bias and brightness

falls below the specified threshold

software configurable brightness mixer

from deflection signals. The blanking can be disabled, if

desired

deflection signals. The blanking width is register

programmable and can be disabled, if desired

C compatible microcontroller interface

20048401

December 2002

www.national.com

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