LM1237BDBC/NA National Semiconductor, LM1237BDBC/NA Datasheet

LM1237BDBC/NA

Manufacturer Part Number

LM1237BDBC/NA

Description

Video ICs, 150MHz I2C Compatible RGB Preamplifier with Internal 254 Character OSD and 4 DACs

Manufacturer

National Semiconductor

Datasheet

1.LM1237BDBCNA.pdf (42 pages)

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LM1237

150 MHz I

254 Character OSD and 4 DACs

General Description

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

It has an I

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

Block and Connection Diagram

C compatible microcontroller interface

C compatible interface which allows control of all

C Compatible RGB Preamplifier with Internal

FIGURE 1. Order Number LM1237BAAF/NA

DS200234

See NS Package Number N24D

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

n OSD override allows OSD messages to override video

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

n Spot killer which blanks the video outputs when V

n Suitable for use with discrete or integrated clamp, with

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

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

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

characters, or (c) some combination in between.

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

bias and brightness

falls below the specified threshold

software configurable brightness mixer

20023401

January 2004

www.national.com

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