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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS843034A01 датащи(PDF) 17 Page - Integrated Circuit Systems |
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ICS843034A01 датащи(HTML) 17 Page - Integrated Circuit Systems |
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17 / 22 page  843034AY-01 www.icst.com/products/hiperclocks.html REV. C NOVEMBER 28, 2005 17 Integrated Circuit Systems, Inc. ICS843034-01 FEMTOCLOCKS™ MULTI-RATE LVPECL FREQUENCY SYNTHESIZER PRELIMINARY TERMINATION FOR 2.5V LVPECL OUTPUT Figure 7A and Figure 7B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to ter- minating 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 7B can be eliminated and the termination is shown in Figure 7C. FIGURE 7C. 2.5V LVPECL TERMINATION EXAMPLE R2 50 Zo = 50 Ohm VCCO=2.5V R1 50 Zo = 50 Ohm + - 2.5V 2,5V LVPECL Driv er FIGURE 7B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE VCCO=2.5V R1 50 R2 50 Zo = 50 Ohm R3 18 2,5V LVPECL Driv er Zo = 50 Ohm + - 2.5V FIGURE 7A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 2.5V 2,5V LVPECL Driv er R3 250 Zo = 50 Ohm Zo = 50 Ohm R4 62.5 2.5V + - R1 250 VCCO=2.5V |
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