LM1237AAFSLASHNA datasheet(1/42 Pages) NSC

部件名	LM1237AAF/NA

功能描述	150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs

PDF	42 Pages

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM1237

150 MHz I

2C Compatible RGB Preamplifier with Internal

254 Character OSD and 4 DACs

General Description

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

It has an I

2C 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 LM1237 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

I

2C compatible microcontroller interface

n

Internal 254 character OSD usable as either (a) 190

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

characters, or (c) some combination in between.

n

OSD override allows OSD messages to override video

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

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

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

register programmable width)

n

Power Saving Mode with 80% power reduction

n

Matched to LM246x driver and LM2479/80 drivers

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

Block and Connection Diagram

20023401

FIGURE 1. Order Number LM1237AAF/NA

See NS Package Number N24D

September 2002

DS200234

www.national.com

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National Semiconductor ...	LM1237	1Mb / 42P	150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs
National Semiconductor ...	LM1237	1Mb / 42P	150 MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs

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