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AN826
Crystal Oscillator Basics and Crystal Selection for rfPICTM and PICmicro® Devices
Author: Steven Bible Microchip Technology Inc.
• • • • • • • • What temperature stability is needed? What temperature range will be required? Which enclosure (holder) do you desire? What load capacitance (CL) do you require? What shunt capacitance (C0) do you require? Is pullability required? What motional capacitance (C1) do you require? What Equivalent Series Resistance (ESR) is required? • What drive level is required? To the uninitiated, these are overwhelming questions. What effect do these specifications have on the operation of the oscillator? What do they mean? It becomes apparent to the product design engineer that the only way to answer these questions is to understand how an oscillator works.