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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LXT971ABC датащи(PDF) 49 Page - Intel Corporation |
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LXT971ABC датащи(HTML) 49 Page - Intel Corporation |
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49 / 90 page  LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet 49 Document #: 249414 Revision #: 002 Rev. Date: August 7, 2002 Figure 22. Typical Twisted-Pair Interface - Switch TPFIP TPFIN RJ-45 * = 0.001 µF / 2.0 kV 3 6 1 2 1:1 LXT971A 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 50 Ω 4 5 8 7 1:1 1 TPFOP TPFON VCCA GND 0.1 µF .01 µF 2 270 pF 5% 270 pF 5% 0.01 µF 50 Ω 1% 50 Ω 1% ** 3 SD/TP 4 0.1 µF 1. Center-tap current may be supplied from 3.3 V VCCA as shown. Additional power savings may be realized by supplying the center-tap from a 2.5 V current source. A separate ferrite bead (rated at 50 mA) should be used to supply center-tap current. 2. The 100 Ω transmit load termination resistor typically required is integrated in the LXT971A. 3. Magnetics without a receive pair center-tap do not require a 2 kV termination. 4. RJ-45 connections shown are for a standard switch application. For a standard NIC RJ-45 setup, see Figure 23 on page 50. |
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