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LM1296 Datasheet

  • LM1296

  • Raster Geometry Correction System for Multi-Frequency Displa...

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  • NSC

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LM1296 Raster Geometry Correction System for Multi-Frequency Displays
February 1998
LM1296
Raster Geometry Correction System for Multi-Frequency
Displays
General Description
The LM1296 is a monolithic IC for use in the raster scanning
circuitry of a multi-frequency CRT monitor. The IC provides
an S-corrected sawtooth waveform and a variable DC output
voltage. These two outputs drive the vertical deflection am-
plifier. It also provides another waveform for East-West ge-
ometry correction which includes pincushion, corner, and
trapezoid controls. The geometry correction is controlled by
DC input voltages from 0V to 4V.
The raster height and the raster vertical position can be con-
trolled by two DC voltage input pins that adjust the sawtooth
waveform amplitude and the variable DC output voltage. The
East-West correction of the LM1296 has height tracking and
vertical position tracking capabilities. As the height or posi-
tion of the raster is adjusted the geometry correction is main-
tained by the chip automatically.
The LM1296 is packaged in a 16-pin plastic DIP package.
Accepts either polarity of V sync
DC-controlled correction terms
Raster vertical position control
Vertical S-correction (linearity) control
East-West pincushion control
East-West trapezoid control
East-West corner control
Provides both polarities of correction output
East-West correction tracks raster vertical position and
height
n
Compatible with LM1290 and LM1292 horizontal PLL
n
n
n
n
n
n
n
n
n
Applications
n
Vertical deflection of monitors
Features
n
Vertical scanning frequency 50 Hz鈥?65 Hz
Connection Diagram
DS012894-1
FIGURE 1.
Order Number LM1296N
See NS Package Number N16A
漏 1998 National Semiconductor Corporation
DS012894
www.national.com

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