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LM1296N データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1296N
部品情報  Raster Geometry Correction System for Multi-Frequency Displays
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1296N データシート(HTML) 6 Page - National Semiconductor (TI)

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Functional Description (Continued)
Pin 1 (POSITION) not only controls the pin 13 output, but
also the center position of the correction waveform at pin 11
(E-W OUT). As a result, the geometry correction tracks the
vertical position of the CRT raster. See
Figure 5 through Fig-
ure 7.
The Pincushion Control Block and the Corner Control Block
are non-linear analog circuits. They convert the sawtooth
waveform into 2nd order and 4th order parabolic waveforms.
These two parabolic waveforms, together with a sawtooth
(1st order), are summed and then buffered out at pin 11
(E-W OUT). See waveforms in the Typical Performance
Characteristics section. The amplitudes of the 1st, 2nd and
4th order components in the correction waveform are con-
trolled by the DC voltages at pin 8 (TRAPEZOID), pin 9
(CORNER) and pin 10 (PINCUSHION).
Pin Descriptions
See
Figure 8 through Figure 13 for input and output sche-
matics.
Pin 1. POSITION: A 0V to 4V DC voltage applied to this pin
sets pin 13 (DC OUT) output voltage from 3.65V to 4.05V.
See
Figure 8 for the input schematic.
Pin 2. HEIGHT: A 0V to 4V DC voltage applied to this pin
sets the output amplitude of the sawtooth waveform at pin 15
(SAWTOOTH OUT) as well as the output amplitude of the
correction waveform at pin 11 (E-W OUT). See
Figure 9 for
the input schematic.
Pin 3. C
F: A 0.47 µF capacitor is connected from this pin to
ground. This capacitor prevents the Injection-Locked Oscilla-
tor from locking at twice the V sync frequency.
Pin 4. C
ALC: A filter capacitor for the automatic level control
circuit (ALC) is connected from this pin to ground. The ALC
circuit maintains the output amplitudes of SAWTOOTH OUT
and E-W OUT regardless of the V sync frequency. The rec-
ommended capacitance of C
ALC is between 1 µF to 4.7 µF.
Pin 5. C
OSC: A timing capacitor for the Injection-Locked Os-
cillator is connected from this pin to ground. The recom-
mended capacitance is 0.15 µF. Increasing the capacitance
will lower the lowest lock frequency.
Pin 6. GND: Ground pin.
Pin 7. V SYNC: This pin accepts AC-coupled V sync of ei-
ther polarity. See
Figure 10 for the input schematic. The input
sensitivity of this pin is about 1 V
PP. For best noise immunity,
a resistor of 10 k
Ω in parallel with a filter capacitor of 0.01 µF
should be connected from the input side of the coupling ca-
pacitor to ground. The values of these components may be
varied depending on the application and the ambient noise
level inside the monitor. A DC voltage of 0V or 4V on this pin
will cause the device to free run at about 40 Hz.
Pin 8. TRAPEZOID: A 0V to 4V DC voltage applied to this
pin adjusts the polarity and the amount of linear sawtooth
component (Trapezoid Correction) in the E-W OUT output.
At approximately 2V, the amount is zero. A voltage above 2V
sets a negative-sloped sawtooth output, increasing the volt-
age increases the sawtooth amplitude. A voltage below 2V
sets a positive-sloped sawtooth output, decreasing the volt-
age increases the sawtooth amplitude. See
Figure 11 for the
input schematic.
Pin 9. CORNER: A 0V to 4V DC voltage applied to this pin
adjusts the polarity and the amount of 4th order parabolic
component (Corner Correction) in the E-W OUT output. At
approximately 2V, the amount is zero. A voltage above 2V
sets a concave down 4th order output, increasing the voltage
increases the 4th order amplitude. A voltage below 2V sets a
concave up 4th order output, decreasing the voltage in-
creases the 4th order amplitude. See
Figure 11 for the input
schematic.
Pin 10. PINCUSHION: A 0V to 4V DC voltage applied to this
pin adjusts the polarity and the amount of 2nd order para-
bolic component (Puncushion Correction) in the E-W OUT
output. At approximately 2V, the amount is zero. A voltage
above 2V sets a concave down 2nd order output, increasing
the voltage increases the 2nd order amplitude. A voltage be-
low 2V sets a concave up 2nd order output, decreasing the
voltage increases the 2nd order amplitude. See
Figure 11 for
the input schematic.
DS012894-11
FIGURE 5. Raster Position Centered
DS012894-12
FIGURE 6. Raster Position Up
DS012894-13
FIGURE 7. Raster Position Down
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