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AN827 - The Technique of Direct Programming

General Description

.

quency) to give a new reference frequency: channel spacing/P.

Another solution is found by considering the defining Equation 1 for fout of Figure 1.

Key Features

  • . Z0 Z1 Z2 A E fin C1 MTTLout MC12013 Z3 fin P0 P1 P2 P3 B1 fout MC12014 Eo B C fout Q0 C Q1 Q2 Q3 MC4018 PE Q0 C Q1 Q2 Q3 MC4016 PE C MC4018 B R PE A NP0 NP1 Figure 4. Direct Programming Utilizing Two.
  • Modulus Prescaler www. Data.

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by AN827/D AN827 The Technique of Direct Programming by Using a Two-Modulus Prescaler Prepared by: PLL Applications The theory in this application note is still applicable, but some of the products referenced may be discontinued. INTRODUCTION The MC12009, MC12011, or MC12013 can be used as part of a variable modulus (divisor) prescaling subsystem used in certain Digital Phase–Locked Loops (PLL). More often than not, the feedback loop of any PLL contains a counter–divider. Many methods are available for building a divider, but not all are simple, economical, or convenient in a particular application. The technique and system described here offer a new approach to the construction of a phase–locked loop divider.