Datasheet > LM1237BDLA

LM1237BDLA

更新时间： 2024-11-05 00:04:27

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数据手册

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LM1237BDLA 数据手册

January 2004

LM1237

150 MHz I²C Compatible RGB Preamplifier with Internal

254 Character OSD and 4 DACs

n Internal 254 character OSD usable as either (a) 190

General Description

2-color plus 64 4-color characters, (b) 318 2-color

The LM1237 pre-amp is an integrated CMOS CRT preamp.

characters, or (c) some combination in between.

It has an I²C compatible interface which allows control of all

the parameters necessary to directly setup and adjust the

n OSD override allows OSD messages to override video

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

gain and contrast in the CRT display. Brightness and bias

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

can be controlled through the DAC outputs which are well

bias and brightness

matched to the LM2479 and LM2480 integrated bias clamp

ICs. The LM1237 preamp is also designed to be compatible

with the LM246x high gain driver family.

n Spot killer which blanks the video outputs when V_CC

falls below the specified threshold

n Suitable for use with discrete or integrated clamp, with

software configurable brightness mixer

n H and V blanking (V blanking is optional and has

n Power Saving Mode with 80% power reduction

n Matched to LM246x driver and LM2479/80 drivers

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.

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

Features

n I²C compatible microcontroller interface

Block and Connection Diagram

20023401

FIGURE 1. Order Number LM1237BAAF/NA

See NS Package Number N24D

DS200234

www.national.com

Free Datasheet Download http://www.Chinadz.Com

http://www.Icver.Com

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