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843071 Datasheet(PDF) 11 Page - Renesas Technology Corp |
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843071 Datasheet(HTML) 11 Page - Renesas Technology Corp |
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11 / 19 page ![]() REVISION C 10/19/15 11 FEMTOCLOCK® CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR 843071 DATA SHEET Termination for 2.5V LVPECL Outputs Figure 5A and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50 to VCC –2V. For VCC = 2.5V, the VCC – 2V is very close to ground level. The R3 in Figure 5B can be eliminated and the termination is shown in Figure 5C. Figure 5A. 2.5V LVPECL Driver Termination Example Figure 5C. 2.5V LVPECL Driver Termination Example Figure 5B. 2.5V LVPECL Driver Termination Example 2.5V LVPECL Driver VCCO = 2.5V 2.5V 2.5V 50 50 R1 250 R3 250 R2 62.5 R4 62.5 + – 2.5V LVPECL Driver VCCO = 2.5V 2.5V 50 50 R1 50 R2 50 + – 2.5V LVPECL Driver VCCO = 2.5V 2.5V 50 50 R1 50 R2 50 R3 18 + – |
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