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LM1253 Datasheet

IC型号：
LM1253
PDF描述：
National Semiconductor [Monolithic Triple 180 MHz I2C CRT P...
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LM1253A Monolithic Triple 180 MHz I

2

C CRT Pre-amp With Integrated Analog On Screen Display

(OSD) Generator

May 2000

LM1253A

Monolithic Triple 180 MHz I

2

C CRT Pre-amp With

Integrated Analog On Screen Display (OSD) Generator

General Description

The LM1253A pre-amp is an integrated high voltage triple

CRT pre-amp and Analog On Screen Display (OSD) genera-

tor. The IC is I

2

C controlled, and allows control of all the pa-

rameters necessary to setup and adjust the brightness and

contrast in the CRT display. In addition, it provides a pro-

grammable period vertical blanking pulse which is used to

blank the G1.

The LM1253A pre-amp is designed to work in cooperation

with the LM2453 driver, and provides a multiplexed video

signal (VideoPlex) interface to enable the DC clamp levels at

the cathode to be varied in order to set up the CRT bias and

to allow individual adjustment for brightness.

The Analog OSD has a selectable palette allowing a wide se-

lection of colors. The preset level of the OSD can be con-

trolled by I

2

C to suit different CRT displays. The OSD signal

is internally mixed with the video signal, before the gain sec-

tion, and thus gives excellent white tracking of the OSD with

the white color point setting of the video.

The Brightness settings are also mixed into the video signal

before the gain matching controls and consequently give ex-

cellent white color point tracking with variations in the Bright-

ness control. An active horizontal blanking signal is added to

the video at the output, giving excellent smear performance,

and preventing video content dependent DC bias offsets as

a result of high frequency over shoot.

The OSD horizontal sync and blanking signal is derived from

a positive going flyback pulse. The digital section provides

easy interfacing of this signal with the deflection circuits.

The vertical blanking signal is taken from the vertical sync

signal, and the blanking duration is programmable. This sys-

tem is highly integrated and requires a minimal number of

external components.

Black level clamping of the signal is carried out directly on

the AC coupled input signal into the high impedance pream-

plifier input, thus eliminating the need for additional black

level clamp capacitors.

The outputs are referenced to a DC level produced by the

LM1253A Pre-amp, and so are guaranteed to provide stable

DC operating levels within the system without the need for

additional external feedback components.

The IC is packaged in an industry standard wide body 28-

lead DIL molded plastic package.

Features

n

190 two-color ROM based Character Fonts

n

64 four-color ROM based Character Fonts

n

Supports a programmable page size with up to 512

characters and line definition codes

n

Support for 2 Display Windows (size of each window is

configurable)

n

Programmable start position for each Display Window

n

Programmable Resolutions: from 512 to 960 pixels per

line in 64 pixel increments

n

Programmable Character Height, with automatic height

control with mode change

n

Programmable Row Spacing between each display

character row

n

Maximum Pixel clock of 92.2 MHz

n

I

2

C compatible interface to controlling micro-controller

n

Button boxes

n

180 MHz preamplifier with full video signal parametric

control

n

VideoPlex

鈩?/div>

interface to the LM2453 driver

n

OSD mixing with 64 out of 512 color mask

programmable selection

Intended Applications

n

1280 x 1024 Displays up to 75 Hz requiring OSD

capability

漏 2000 National Semiconductor Corporation

DS101265

www.national.com

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