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LM1270N データシート(PDF) 7 Page - National Semiconductor (TI) |
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LM1270N データシート(HTML) 7 Page - National Semiconductor (TI) |
7 / 27 page Pin Descriptions (Continued) Pin No. Pin Name Schematic Description 17 18 Ground V CC Ground pin for the output analog portion of the LM1270 circuitry, and power supply pin for all the analog of the LM1270. 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 Video Out Red Video Out Blue Video Out Video outputs of the LM1270. Typically the output is set to 0.7 V P-P to drive any standard video pre-amp. When Hi-Brite is activated the user can set the video output as high as 1.0 V P-P. 22 V REF Cap Provides filtering for the internal voltage which sets the internal bias current in conjunction with R EXT.A minimum of 0.1 µF is recommended for proper filtering. This capacitor should be placed as close to pin 22 and the analog ground return as possible. This pin can also be set to use an external V REF. 23 V REFREXT Sets the internal current sources through a 10 k Ω 1% external resistor. Resistor value and accuracy is critical for optimum operation of the LM1270. This resistor should be placed as close to pin 23 and the analog ground return as possible. 24 Clamp This pin can either accept an external clamp pulse or send an internally generated clamp pulse to the video circuits. As an input this pin accepts either TTL or CMOS logic levels. The internal switching threshold is approximately one-half of V CC.An external series resistor, R CLP, of about 1 k Ω is recommended to avoid overdriving the input devices, or for current limiting the drivers if being used as an output. C CLP may be necessary for filtering noise on the clamp input. R LOAD should be used if this pin is an output with a value of about 10 k Ω. www.national.com 7 |
同様の部品番号 - LM1270N |
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同様の説明 - LM1270N |
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