データシートサーチシステム |
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LM1247 データシート(PDF) 6 Page - National Semiconductor (TI) |
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LM1247 データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 48 page LM1253A and LM1237 Compatibility In order to maintain register compatibility with the LM1253A and LM1237 preamplifier datasheet assignments for bias and brightness, the color assignments are recommended as shown in Table 2. If datasheet compatibility is not required, then the DAC assignments can be arbitrary. TABLE 2. LM1253A/LM1237 Compatibility DAC Bias Outputs LM1247 Pin: DAC 1 DAC 2 DAC 3 DAC 4 Assignment: Blue Green Red Brightness OSD vs Video Intensity The OSD amplitude has been increased over the LM1237 level. During monitor alignment, the three gain registers are used to achieve the desired front of screen color balance. This also causes the OSD channels to be adjusted accord- ingly, since these are inserted into the video channels prior to the gain attenuators. This provides the means to fine tune the intensity of the OSD relative to the video as follows. If a typical starting point for the alignment is to have the gains at maximum (0x7F) and the contrast at 0x55, the resultant OSD intensity will be higher than if the starting point is with the gains at 0x55 and the contrast at maximum (0x7F). This tradeoff allows fine tuning the final OSD intensity relative to the video. In addition, the OSD contrast register, 0x8438 [4:3], provides 4 major increments of intensity. Together, these allow setting the OSD intensity to the most pleasing level. ESD Protection The LM1247 features a 3.0 KV ESD protection level (see (Notes 4, 13)). This is provided by special internal circuitry which activates when the voltage at any pin goes beyond the supply rails by a preset amount. At that time the protection is applied to all pins, including SDA and SCL. If any signal other than these two is applied to the LM1247 while the V CC is near zero, such as horizontal and vertical deflection pulses of sufficient amplitude, this protection will activate and pre- vent any communication on the I 2C bus common to the LM1247, until the other signal or signals are removed. Nor- mally, with all other pins unenergized, the LM1247 will not affect I 2C communication when it is powered down. www.national.com 6 |
同様の部品番号 - LM1247 |
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同様の説明 - LM1247 |
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