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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM7968 датащи(PDF) 74 Page - Advanced Micro Devices |
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AM7968 датащи(HTML) 74 Page - Advanced Micro Devices |
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74 / 127 page  AMD 70 TAXIchip Integrated Circuits Technical Manual Sample Values Using RG-58A/U, 50 Ω coaxial cable, a successful TAXI link was established using the following component values: R1 = 68 Ω R2 = 200 Ω RE = 300 Ω C = 0.1 µF 5.7 Interfacing to Twisted-Pair Cable Another low cost alternative twisted pair cable. Twisted pair cable is generally more lossy than coaxial cable making it suitable only for short distances. To reduce the possibility of noise being induced along the line, the shielded twisted-pair cable is recommended. Using the TAXlchip set with shielded-twisted-pair as the serial medium is very similar to using it with coaxial cable. The recommended configuration is shown in Figure 5-11, where each of the components that make up the interface serve the same purpose as in the AC-coupled TAXl-fiber optic interface shown in Figure 5-9. Note that with shielded-twisted-pair, only one cable is required to form the link. The twisted-pair conductors carry the differential pseudo-ECL signals and the shield is grounded at the Receiver. Figure 5-11 Shielded-Twisted Pair Cable Interface 12330E-18 R1 RE L, Z0 C C C RE +5 V R2 R1 + – + – +5 V R2 R1R2 R1+ R2 = Z0/2 5R2 R1+ R2 = 3.7 V = Midpoint of Pseudo ECL Signal Swing 186 ≤ RE ≤ 7.2 (Z0) C = Largest RF Capacitor Available TAXI TX TAXI RX |
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