Datasheet > LM1238

LM1238

更新时间： 2024-11-04 22:51:59

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
24页	1203K
描述
110 MHz I2C Compatible RGB Preamplifier with Internal Simple OSD Generator and 4 DACs

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LM1238 数据手册

June 2003

LM1238

110 MHz I²C Compatible RGB Preamplifier with Internal

Simple OSD Generator and 4 DACs

n OSD override allows OSD messages to be displayed

while blanking input video

General Description

The LM1238 pre-amp is an integrated, three channel video

n Internally generated burn-in screen

pre-amp. It has an I2C compatible interface which allows

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

control of all the parameters necessary to directly setup and

bias and brightness

adjust the gain and contrast in the CRT display. Four I2C

compatible DACs are available to control monitor bias and

brightness circuits. The LM1238 preamp is designed to be

100% compatible with the LM246x high gain driver family

and the LM2479/80 Clamp ICs.

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 65% power reduction

n Matched to LM246x driver and 2479/80 clamp

Black level clamping of the video signal is carried out directly

on the AC coupled input signal into the high impedance

pre-amplifier inputs, 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.

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

n Internal OSD generator with 16 sets of color icons

Block and Connection Diagram

20038701

FIGURE 1. Order Number LM1238AAC/NA

See NS Package Number N24D

DS200387

www.national.com

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