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ICS85320AMILF Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS85320AMILF Datasheet(HTML) 8 Page - Integrated Device Technology |
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8 / 16 page ![]() IDT™ / ICS™ 3.3V, 2.5V LVPECL TRANSLATOR 8 ICS8532AMI REV A NOVEMBER 13, 2006 ICS85320I LVCMOS/LVTTL-TO-DIFFERENTIAL 3.3V, 2.5V 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 terminating 50 Ω to V CC - 2V. For V CC = 2.5V, the V CC - 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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