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National Semiconductor - DC Controlled Geometry Correction System for Continuous Sync Monitors

Numéro de référence LM1295
Description DC Controlled Geometry Correction System for Continuous Sync Monitors
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM1295 fiche technique
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
n Vertical scanning frequency 50 Hz–170 Hz
n DC controlled correction term amplitudes
n Up to 125 kHz bandwidth for dynamic input signals
n Minimum external parts count
n Multiple IC connection for convergence applications
flexibility
n Stable vertical amplitude over temperature
n Compatible with the LM1291 Horizontal PLL in a H/V
system
n Dynamic vertical deflection correction for second anode
high voltage drop
n Both positive and negative going correction signals
Connection Diagram
DS012324-1
FIGURE 1. Order Number LM1295N
See NS Package Number N24C
© 1999 National Semiconductor Corporation DS012324
www.national.com

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