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Figure 1 shows a generic block diagram for connecting a prescaler to a PLL device

that supports dual modulus control. Application note AN535 decribes using a two-

modulus prescaler technique.By using prescaler higher frequencies can be achieve

than by a single CMOS PLL device.

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Figure 1. Generic block diagram showing prescaler connection to

PLL device

VCO

Loop Filter

Prescaler

PLL

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Fout

Fin

MC

MC in

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Issue B