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ICS843404 Datasheet(PDF) 13 Page - Integrated Circuit Systems |
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ICS843404 Datasheet(HTML) 13 Page - Integrated Circuit Systems |
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13 / 19 page ![]() 843404AG www.icst.com/products/hiperclocks.html REV. A OCTOBER 17, 2005 13 Integrated Circuit Systems, Inc. ICS843404 LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR TERMINATION FOR 2.5V LVPECL OUTPUT Figure 5A and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminat- ing 50 Ω to V DD - 2V. For VDDO = 2.5V, the VDDO - 2V is very close to ground level. The R3 in Figure 5B can be eliminated and the termination is shown in Figure 5C. FIGURE 5C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 5B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 R3 250 2.5V VDDO=2.5V Zo = 50 Ohm R1 250 + - 2,5V LVPECL Driv er R4 62.5 2.5V Zo = 50 Ohm Zo = 50 Ohm + - VDDO=2.5V R2 50 R1 50 2,5V LVPECL Driv er 2.5V R3 18 Zo = 50 Ohm Zo = 50 Ohm R1 50 VDDO=2.5V 2.5V R2 50 2,5V LVPECL Driv er Zo = 50 Ohm + - |
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