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LM1253AN データシート(PDF) 10 Page - National Semiconductor (TI) |
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LM1253AN データシート(HTML) 10 Page - National Semiconductor (TI) |
10 / 57 page Pin Descriptions (Continued) Pin 13 — Clamp A positive going clamp signal is input on this pin. Using this signal black level clamping of the video is carried out directly on the input video that is AC coupled into the high impedance preamplifier input, thus eliminating the need for additional black level clamp capacitors. Figure 29 shows the external schematic of pin 13, Figure 17 shows the internal schematic. An optional capacitor to ground may be needed if noise interferes with the clamp signal. Pin 14 — H Flyback H Flyback is an analog signal input from the monitor horizontal scan. HBLANK is a digital signal de- rived from the horizontal flyback pulse as shown in Figure 9. An optional capacitor and/or resistor to ground may be needed if noise interferes with the H Flyback signal. The horizontal flyback from the monitor must be a clean sig- nal. There should be no ringing or other noise on the flyback. DS101265-70 FIGURE 8. Effect of ABL Voltage on V OUT www.national.com 10 |
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同様の説明 - LM1253AN |
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