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LM1295 DC Controlled Geometry Correction System for Continuous Sync Monitors

April 1999

LM1295

DC Controlled Geometry Correction System for

Continuous Sync Monitors

General Description

The LM1295 is specifically designed for use in a continuous

sync monitor. The injection-locked vertical oscillator oper-

ates from 50 Hz to 170 Hz, covering all known video moni-

tors. A differential output current is provided in order to pre-

vent ground interaction.

The IC provides two outputs composed of the summation of

DC controlled 1st and 2nd order output terms. The first out-

put corrects for EW pincushion and trapezoid. The second

corrects for parallelogram and bow.

A DC controlled output is provided for vertical dynamic focus

correction.

The IC is packaged in a 24-pin narrow DIP package and op-

erates on a single 12V power supply.

Features

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Vertical scanning frequency 50 Hz鈥?70 Hz

DC controlled correction term amplitudes

Up to 125 kHz bandwidth for dynamic input signals

Minimum external parts count

Multiple IC connection for convergence applications

flexibility

Stable vertical amplitude over temperature

Compatible with the LM1291 Horizontal PLL in a H/V

system

Dynamic vertical deflection correction for second anode

high voltage drop

Both positive and negative going correction signals

Connection Diagram

DS012324-1

FIGURE 1. Order Number LM1295N

See NS Package Number N24C

漏 1999 National Semiconductor Corporation

DS012324

www.national.com

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