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Last modified 2007-05-02

PLL01A

PLL frequency synthesizer

Overview

This PLL-circuit use an 8 bit BCD binary programmable divide-by-N counter.

Down-converting of the frequency to the divider

This PLL circuit use a mixer and a XTAL oscillator to convert the output frequency f _OUT to the f _IN to the PLL Circuit.
The X-Tal frequency is f _XTAL = f _OUT - f _IN



The output frequency can be changed by changing the mixing-XTAL or add a new mixing-XTAL to the oscillator.

Pin	Name	Description
1	VDD	Positive oower supply
2	F in	VCO oscillator input
3	RI	Reference oscillator input (10.240MHz)
4	FS	High=10kHz - Low=5kHz
5	PD	VCO voltage out
6	LD	Loop detected - High=Locked Low=Unlocked
7	P out	Prog. Out
8	P7	Programmable input (Binary)
9	P6	Programmable input (Binary)
10	P5	Programmable input (Binary)
11	P6	Programmable input (Binary)
12	P3	Programmable input (Binary)
13	P2	Programmable input (Binary)
14	P1	Programmable input (Binary)
15	P0	Programmable input (Binary)
16	Vss	Ground

See also the explanation of PLL pin functions