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LM1247 bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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LM1247 bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
9 / 48 page Typical Performance Characteristics V CC =5V, TA = 25˚C unless otherwise specified (Continued) TABLE 3. OSD Register recommendations PPL=0 PPL=1 PPL=2 PPL=3 PPL=4 PPL=5 PPL=6 PPL=7 PLL=1 25 - 61 25 - 53 25 - 48 25 - 43 25 - 40 25 - 36 25 - 34 25 - 31 PLL=2 NR NR 48 - 98 43 - 88 40 - 81 36 - 74 34 - 69 31 - 64 PLL=3 NR NR NR 88 - 110 81 - 110 74 - 110 69 - 110 64 - 110 Pin Descriptions and Application Information Pin No. Pin Name Schematic Description 1 V Flyback Required for OSD synchronization and is also used for vertical blanking of the video outputs. The actual switching threshold is about 35% of V CC. For logic level inputs C4 can be a jumper, but for flyback inputs, an AC coupled differentiator is recommended, where R V is large enough to prevent the voltage at pin 1 from exceeding V CC or going below GND. C4 should be small enough to flatten the vertical rate ramp at pin 1. C 24 may be needed to reduce noise. 2V REF Bypass 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 2 and the pin 4 ground return as possible. 3V REF External resistor, 10k 1%, sets the internal bias current level for optimum performance of the LM1247. This resistor should be placed as close to pin 3 and the pin 4 ground return as possible. 4 Analog Input Ground This is the ground for the input analog portions of the LM1247 internal circuitry. 5 6 7 Blue Video In Red Video In Green Video In These video inputs must be AC coupled with a .0047 µF cap. Internal DC restoration is done at these inputs. A series resistor of about 33 Ω and external ESD protection diodes should also be used for protection from ESD damage. www.national.com 9 |
Số phần tương tự - LM1247 |
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Mô tả tương tự - LM1247 |
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