Datasheet > LM1247

LM1247

更新时间： 2024-11-25 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
48页	3131K
描述
150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs

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LM1247 数据手册

December 2002

LM1247

150 MHz I²C Compatible RGB Preamplifier with Internal

512 Character OSD ROM, 512 Character RAM and 4

DACs

n I²C compatible microcontroller interface

General Description

n OSD override allows OSD messages to override video

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

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

It has an I²C compatible interface which allows control of all

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

the parameters necessary to directly setup and adjust the

bias and brightness

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.

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 Horizontal blanking and OSD synchronization directly

from deflection signals. The blanking can be disabled, if

desired

n Vertical blanking and OSD synchronization directly from

deflection signals. The blanking width is register

programmable and can be disabled, if desired

n Power Saving Mode with 65% power reduction

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

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

Features

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

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

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

characters, or (c) some combination in between

n Internal 512 character RAM, which can be displayed as

one single or two independent windows

Internal Block Diagram

20048401

FIGURE 1. Order Number LM1247AAG/NA

See NS Package Number N24D

DS200484

www.national.com

12 3 4 5 6 7...48

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与LM1247相关器件

型号	品牌	获取价格	描述	数据表
LM1247AAG/NA	NSC	获取价格	150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character
LM124A	STMICROELECTRONICS	获取价格	LOW POWER QUAD OPERATIONAL AMPLIFIERS
LM124A	TI	获取价格	QUADRUPLE OPERATIONAL AMPLIFIERS
LM124A	NSC	获取价格	Low Power Quad Operational Amplifiers
LM124AD	STMICROELECTRONICS	获取价格	LOW POWER QUAD OPERATIONAL AMPLIFIERS
LM124ADR	TI	获取价格	QUADRUPLE OPERATIONAL AMPLIFIERS
LM124ADT	ETC	获取价格	Voltage-Feedback Operational Amplifier
LM124AE	NSC	获取价格	Low Power Quad Operational Amplifiers
LM124AE/883	TI	获取价格	LM124AQML LM124QML Low Power Quad Operational Amplifiers
LM124AF	NXP	获取价格	QUAD OP-AMP, 4000uV OFFSET-MAX, 1MHz BAND WIDTH, CDIP14, CERDIP-14

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