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 operates
from 50 Hz to 170 Hz, covering all known video monitors.
A differential output current is provided in order to prevent
ground interaction.
The IC provides two outputs composed of the summation of
DC controlled 1st and 2nd order output terms. The first output
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 operates
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