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LM1238 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM1238 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 24 page Pin Descriptions and Application Information (Continued) Pin No. Pin Name Schematic Description 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 Kohms 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 digital portion of the LM1238 circuitry, and power supply pin for both analog and digital sections of the LM1238. Note the recommended charge storage and high frequency capacitors which should be as close to pins 17 and 18 as possible. 19 20 21 Green Output Red Output Blue Output These are the three video output pins. They are intended to drive the LM246x family of cathode drivers. Nominally, about 2V peak to peak will produce 40V peak to peak of cathode drive. www.national.com 9 |
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