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SI53321 Datasheet(PDF) 10 Page - Silicon Laboratories |
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SI53321 Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 28 page Si53321 10 Rev. 1.0 2.4. Output Clock Termination Options The recommended output clock termination options are shown below. Unused outputs should be left unconnected. Figure 6. LVPECL Output Termination Si533xx R1 VDDO R2 R1 R2 50 50 LVPECL Receiver VTERM = VDDO – 2V R1 // R2 = 50 Ohm Q Qn = 3.3V or 2.5V VDDO 3.3V LVPECL: R1 = 127 Ohm, R2 = 82.5 Ohm 2.5V LVPECL: R1 = 250 Ohm, R2 = 62.5 Ohm DC Coupled LVPECL Termination Scheme 1 VDD = VDDO Si533xx 50 50 LVPECL Receiver VTERM = VDDO – 2V Q Qn = 3.3V or 2.5V VDDO 50 50 VDD = VDDO DC Coupled LVPECL Termination Scheme 2 Si533xx R1 VDDO R2 R1 R2 50 50 VBIAS = VDD – 1.3V R1 // R2 = 50 Ohm Rb Rb 0.1 uF AC Coupled LVPECL Termination Scheme 1 Q Qn 0.1 uF = 3.3V or 2.5V VDDO LVPECL Receiver = 3.3V or 2.5V VDD 3.3V LVPECL: R1 = 82.5 Ohm, R2 = 127 Ohm, Rb = 120 Ohm 2.5V LVPECL: R1 = 62.5 Ohm, R2 = 250 Ohm, Rb = 90 Ohm Si533xx 50 50 Rb Rb 0.1 uF AC Coupled LVPECL Termination Scheme 2 Q Qn 0.1 uF = 3.3V or 2.5V VDDO LVPECL Receiver = 3.3V or 2.5V VDD 50 3.3V LVPECL: Rb = 120 Ohm 2.5V LVPECL: Rb = 90 Ohm VBIAS = VDD – 1.3 V 50 |
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