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ICS853052AG Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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ICS853052AG Datasheet(HTML) 7 Page - Integrated Circuit Systems |
7 / 13 page 853052AG www.icst.com/products/hiperclocks.html REV. A JULY 1, 2004 7 Integrated Circuit Systems, Inc. ICS853052 DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL 2.5V, 3.3V, 5V LVPECL MULTIPLEXER PRELIMINARY APPLICATION INFORMATION TERMINATION FOR 2.5V LVPECL OUTPUT Figure 1A and Figure 1B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminat- ing 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 1B can be eliminated and the termination is shown in Figure 1C. FIGURE 1C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 1B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 1A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 Zo = 50 Ohm R1 250 + - 2.5V 2,5V LVPECL Driv er R4 62.5 R3 250 Zo = 50 Ohm 2.5V VCC=2.5V R1 50 R3 18 Zo = 50 Ohm Zo = 50 Ohm + - 2,5V LVPECL Driv er VCC=2.5V 2.5V R2 50 2,5V LVPECL Driv er VCC=2.5V R1 50 R2 50 2.5V Zo = 50 Ohm Zo = 50 Ohm + - |
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