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LM1296
Raster Geometry Correction System for Multi-Frequency Displays
LM1296
Raster Geometry Correction System for Multi-Frequency
Displays
General DescriptionThe LM1296isa monolithicICfor useinthe raster scanning
circuitryofa multi-frequency CRT monitor. TheIC provides S-corrected sawtooth waveform anda variableDC output
voltage. These two outputs drivethe vertical deflection am-
plifier.It also provides another waveformfor East-West ge-
ometry correction which includes pincushion, corner, and
trapezoid controls. The geometry correctionis controlledby input voltages from0Vto 4V.
The raster height andthe raster vertical position canbe con-
trolledby two DC voltage input pins that adjustthe sawtooth
waveform amplitude andthe variableDC output voltage. The
East-West correctionofthe LM1296 has height tracking and
vertical position tracking capabilities.As the heightor posi-
tionofthe rasteris adjustedthe geometry correctionis main-
tainedby the chip automatically.
The LM1296is packagedina 16-pin plastic DIP package.
Features Vertical scanning frequency50 Hz–165Hz Accepts either polarityofV 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 polaritiesof correction output East-West correction tracks raster vertical position and
height Compatible with LM1290 and LM1292 horizontal PLL
Applications Vertical deflectionof monitors
Connection DiagramDS012894-1
FIGURE1.
Order Number LM1296N
See NS Package Number N16AFebruary 1998
LM1296
Raster
Geometry
Correction
System
for
Multi-Frequency
Displays
