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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD8129ARMZ датащи(PDF) 38 Page - Analog Devices |
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AD8129ARMZ датащи(HTML) 38 Page - Analog Devices |
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38 / 40 page  AD8129/AD8130 Rev. C | Page 38 of 40 LAYOUT, GROUNDING, AND BYPASSING The AD8129/AD8130 are very high speed parts that can be sensitive to the PCB environment in which they operate. Realizing their superior specifications requires attention to various details of standard high speed PCB design practice. The first requirement is for a good solid ground plane that covers as much of the board area around the AD8129/AD8130 as possible. The only exception to this is that the ground plane around the FB pin should be kept a few millimeters away, and the ground should be removed from the inner layers and the opposite side of the board under this pin. This minimizes the stray capacitance on this node and helps preserve the gain flatness vs. frequency. The power supply pins should be bypassed as close as possible to the device to the nearby ground plane. Good high frequency ceramic chip capacitors should be used, and the bypassing should be done with a capacitance value of 0.01 μF to 0.1 μF for each supply. Farther away, low frequency bypassing should be provided with 10 μF tantalum capacitors from each supply to ground. The signal routing should be short and direct to avoid parasitic effects. Where possible, signals should be run over ground planes to avoid radiating or to avoid being susceptible to other radiation sources. |
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