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ICS85320AMI Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS85320AMI Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 14 page 85320AMI www.icst.com/products/hiperclocks.html REV. A AUGUST 25, 2004 8 Integrated Circuit Systems, Inc. ICS85320I LVCMOS / LVTTL-TO-DIFFERENTIAL 2.5V / 3.3V LVPECL TRANSLATOR TERMINATION FOR 2.5V LVPECL OUTPUT Figure 2A and Figure 2B 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 2B can be eliminated and the termination is shown in Figure 2C. FIGURE 2B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 2A. 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 + - FIGURE 2C. 2.5V LVPECL TERMINATION EXAMPLE |
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