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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT8000IP датащи(PDF) 21 Page - Exar Corporation |
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XRT8000IP датащи(HTML) 21 Page - Exar Corporation |
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21 / 24 page  XRT8000 21 Rev. 1.11 SYNC 8 kHz FIN XRT8000 CLK1 CLK2 T1, T1/8 or E1, E1/8 8 kHz Figure 11. Slave Reverse Mode (Cont’d) Output Freq. kHz kHz 1544 193 2048 256 Board Layout Considerations The CLK1 and CLK 2 outputs are surrounded with supply pins (GND(514),Vcc(712). It is recommended to decouple these supplies with a 0.1uF very close to the pins. The positive supply (7,12,15) and ground pins (4,5,14) can all be connected to the Digital Supply and Ground. The internal VCO has its proper supply’s pins (GND 9, Vcc 10) these supply pins have to be decoupled by a 0.1uF capacitor and should be connected to an Analog Supply if possible. If there is no Analog Supply, then connect these pins as close as possible to the supply source. If the layout is done with separate layers for the supplies, cut an island under the XTT8000 such that no current flows under the circuit. It has been observed that coupling can occur because heavy digital currents are flowing under the locations of the XRT8000. |
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