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LM1247 データシート(PDF) 10 Page - National Semiconductor (TI) |
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LM1247 データシート(HTML) 10 Page - National Semiconductor (TI) |
10 / 48 page Pin Descriptions and Application Information (Continued) Pin No. Pin Name Schematic Description 8 10 Digital Ground PLL V CC The ground pin should be connected to the rest of the circuit ground by a short but independent PCB trace to prevent contamination by extraneous signals. The V CC pin should be isolated from the rest of the V CC line by a ferrite bead and bypassed to pin 8 with an electrolytic capacitor and a high frequency ceramic. 9 PLL Filter Recommended topology and values are shown to the left. It is recommended that both filter branches be bypassed to the independent ground as close to pin 8 as possible. Great care should be taken to prevent external signals from coupling into this filter from video, I 2C, etc. 11 SDA The I 2C compatible data line. A pull-up resistor of about 2 k Ω should be connected between this pin and V CC. A resistor of at least 100 Ω should be connected in series with the data line for additional ESD protection. 12 SCL The I 2C compatible clock line. A pull-up resistor of about 2 k Ω should be connected between this pin and V CC. A resistor of at least 100 Ω should be connected in series with the clock line for additional ESD protection. 13 14 15 16 DAC 4 Output DAC 2 Output DAC 3 Output DAC 1 Output DAC outputs for cathode cut-off adjustments and brightness control. DAC 4 can be set to change the outputs of the other three DACs, acting as a brightness control. The DAC values and the special DAC 4 function are set through the I 2C compatible bus. A resistor of at least 100 Ω should be connected in series with these outputs for additional ESD protection. 17 18 Ground V CC Ground pin for the output analog portion of the LM1247 circuitry, and power supply pin for all the analog of the LM1247. Note the recommended charge storage and high frequency capacitors which should be as close to pins 17 and 18 as possible. www.national.com 10 |
同様の部品番号 - LM1247 |
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同様の説明 - LM1247 |
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