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AD9520-1/PCBZ Datasheet(PDF) 79 Page - Analog Devices |
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AD9520-1/PCBZ Datasheet(HTML) 79 Page - Analog Devices |
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79 / 80 page  Data Sheet AD9520-1 Rev. B | Page 79 of 80 Termination at the far end of the PCB trace is a second option. The CMOS outputs of the AD9520-1 do not supply enough current to provide a full voltage swing with a low impedance resistive, far-end termination, as shown in Figure 75. The far-end termination network should match the PCB trace impedance and provide the desired switching point. The reduced signal swing may still meet receiver input requirements in some applications. This can be useful when driving long trace lengths on less critical nets. CMOS CMOS 10Ω 50Ω 100Ω 100Ω VS Figure 75. CMOS Output with Far-End Termination Because of the limitations of single-ended CMOS clocking, consider using differential outputs when driving high speed signals over long traces. The AD9520-1 offers LVPECL outputs that are better suited for driving long traces where the inherent noise immunity of differential signaling provides superior performance for clocking converters. |
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