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LM1296 データシート(PDF) 6 Page - National Semiconductor (TI) |
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LM1296 データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 10 page 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 www.national.com 6 |
同様の部品番号 - LM1296 |
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同様の説明 - LM1296 |
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