LM1276 National Semiconductor Corporation, LM1276 Datasheet

LM1276

Manufacturer Part Number

LM1276

Description

150 Mhz I2c Compatible Rgb Preamplifier With Internal 512 Character Osd Rom, 512 Character Ram And 4 Dacs

Manufacturer

National Semiconductor Corporation

Datasheet

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LM1276

150 MHz I

512 Character OSD ROM, 512 Character RAM and 4

DACs

General Description

The LM1276 pre-amp is an integrated CMOS CRT preamp

with an integrated Hi-Brite Window generator, 512 Character

OSD generator, and an auto size measurement circuit. It has

an I

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

LM1276 preamp is also designed to be compatible with the

LM247x 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 28-lead narrow

DIP molded plastic package.

Features

n Integrated Hi-Brite Window Generator operation

n Programmable Video Emphasis Control.

n 8 Programmable Hi-Brite Windows.

n Hi-Brite Enhancement on full screen, window only, or

n Fully addressable 512 Character OSD.

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

n Internal 512 character RAM.

independent of the Microcontroller.

outside of windows.

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

characters, or (c) some combination in between.

C compatible interface, which allows control of all the

C Compatible RGB Preamplifier with Internal

DS200969

n Enhanced I

n OSD Window Fade In/Fade Out.

n OSD Variable Tone Transparency.

n 3 Bit OSD Contrast.

n Video Data detection for Auto Centering & Sizing.

n 2 Bit Adjustable Burn-in screen Mode with no 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 Programmable ABL Onset for Multi-Limit Applications.

n 4-Bit Programmable start position for internal Horizontal

n Horizontal blanking and OSD synchronization directly

n Vertical blanking and OSD synchronization directly from

n Power Saving Mode with 65% power reduction.

n Matched to LM246x, LM247x drivers, and LM2479/80

Applications

n Ideal preamplifier IC for total Hi-Brite Solution.

n 17" and 19” bus controlled monitors with OSD.

n Low cost systems with LM247x drivers.

allow versatile Page RAM access.

input.

bias and brightness.

falls below the specified threshold.

software configurable brightness mixer.

Blanking.

from deflection signals. The blanking can be disabled, if

desired.

sync signals. The blanking width is register

programmable and can be disabled, if desired.

bias IC’s.

C compatible microcontroller interface to

www.national.com

May 2005

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