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LM1270NA データシート(PDF) 5 Page - National Semiconductor (TI) |
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LM1270NA データシート(HTML) 5 Page - National Semiconductor (TI) |
5 / 27 page Pin Descriptions Pin No. Pin Name Schematic Description 1 2 3 Blue 1 Video In Red 1 Video In Green 1 Video In Channel 1 video inputs. These inputs must be AC coupled with a 0.1 µF cap. DC restoration is done at these inputs. A series resistor of about 33 Ω and external ESD protection diodes should also be used. Channel 1 video passes through the emphasis section used for the Hi-Brite window. When using Hi-Brite the channel 1 input pin must be shorted to the corresponding channel 2 input pin. 4 Analog Input Ground Ground Pin for the input analog circuits of the LM1270 5 6 7 Blue 2 Video In Red 2 Video In Green 2 Video In Channel 2 video inputs. These video inputs must be AC coupled with a 0.1 µF cap. DC restoration is done at these inputs. A series resistor of about 33 Ω and external ESD protection diodes should also be used. When using Hi-Brite the channel 2 input pin must be shorted to the corresponding channel 1 input pin. 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 compatible bus, etc. 11 V Sync Logic level vertical sync signal received from the video card in the PC or sync stripper circuit. www.national.com 5 |
同様の部品番号 - LM1270NA |
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同様の説明 - LM1270NA |
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