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LM1237 データシート(PDF) 8 Page - National Semiconductor (TI) |
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LM1237 データシート(HTML) 8 Page - National Semiconductor (TI) |
8 / 42 page Typical Performance Characteristics V CC = 5V, TA = 25˚C unless otherwise specified (Continued) ABL Gain Reduction The ABL function reduces the contrast level of the LM1237 as the voltage on pin 22 is lowered from V CC to around 2 volts. Figure 8 shows the amount of gain reduction as the voltage is lowered from V CC (5.0V) to 2V. The gain reduction is small until V22 reaches the knee anound 3.7V, where the slope increases. Many system designs will require about 3 to 5 dB of gain reduction in full beam limiting. Additional attenuation is possible, and can be used in special circumstances. However, in this case, video performance such as video linearity and tracking between channels will tend to depart from normal specifications. OSD Phase Locked Loop Table 3. OSD Register recommendations shows the recommended horizontal scan rate ranges (in kHz) for each combination of PLL register setting, 0x843E [1:0], and the pixels per line register setting, 0x8401 [7:5]. These ranges are recommended for chip ambient temperatures of 50oCto70oC. While the OSD PLL will lock for other register combinations and at scan rates outside these ranges, the performance of the loop will be improved if these recommendations are followed. NR means the combination of PLL and PPL is not recommended for any scan rate. TABLE 3. OSD Register recommendations PPL=0 PPL=1 PPL=2 PPL=3 PPL=4 PPL=5 PPL=6 PPL=7 PLL=1 27 - 57 26 - 49 25 - 45 25 - 41 25 - 37 25 - 34 25 - 32 25 - 30 PLL=2 NR NR 45 - 89 41 - 82 37 - 75 34 - 69 32 - 64 30 - 60 PLL=3 NR NR NR 82 - 110 75 - 110 69 - 110 64 - 110 60 - 110 20023460 FIGURE 8. ABL Gain Reduction Curve www.national.com 8 |
同様の部品番号 - LM1237_04 |
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同様の説明 - LM1237_04 |
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