Other useful info

Last modified 2007-05-02


PLL frequency synthesizer


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.
1VDDPositive oower supply
2F inVCO oscillator input
3RIReference oscillator input (10.240MHz)
4FSHigh=10kHz - Low=5kHz
5PDVCO voltage out
6LDLoop detected - High=Locked Low=Unlocked
7P outProg. Out
8P7Programmable input (Binary)
9P6Programmable input (Binary)
10P5Programmable input (Binary)
11P6Programmable input (Binary)
12P3Programmable input (Binary)
13P2Programmable input (Binary)
14P1Programmable input (Binary)
15P0Programmable input (Binary)