LM1246AAA

更新时间： 2024-11-22 22:34:27

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
51页	2782K
描述
150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs

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LM1246AAA 数据手册

November 2003

LM1246

150 MHz I²C Compatible RGB Preamplifier with Internal

512 Character OSD ROM, 512 Character RAM and 4

DACs

n OSD Window Fade In/Fade Out

n OSD Half Tone Transparency

n Video Data dectection for Auto Centering & Sizing

n OSD override allows OSD messages to override video

and the use of burn-in screens with no video output.

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

bias and brightness

n Spot killer which blanks the video outputs when V_CC

falls below the specified threshold

General Description

The LM1246 pre-amp is an integrated CMOS CRT preamp.

It has an I²C compatible interface which allows control of all

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 LM1246 preamp is also designed to be compatible

with the LM246x high gain driver family.

n Suitable for use with discrete or integrated clamp, with

software configurable brightness mixer

n 4-Bit Programmable start position for internal

Horizontal Blanking

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.

Features

n Fully addressable 512 Character OSD, simiilar in

features to the LM1237/LM1247, with selectable 2

byte character addressing or LM1247 bank select

modes

Applications

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

n Enhanced I²C compatible microcontroller interface

to allow versatile Page RAM access

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

DS200685

www.national.com

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与LM1246AAA相关器件

型号	品牌	获取价格	描述	数据表
LM1246AAA/NA	NSC	获取价格	IC 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24, PLASTIC, DIP-24, Audio/Video Amplifier
LM1246NA	NSC	获取价格	150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character
LM1247	NSC	获取价格	150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character
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

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