AD9520-1SLASHPCBZ datasheet(79/80 Pages) AD

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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

10Ω

50Ω

100Ω

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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