AN826 Crystal Oscillator Basics and Crystal Selection for ...

2002 Microchip Technology 1AN826 INTRODUCTIONO scillators are an important component of radio fre-quency (RF) and digital devices. Today, product designengineers often do not find themselves designing oscil-lators because the Oscillator circuitry is provided on thedevice. However, the circuitry is not complete. Selec-tion of the Crystal and external capacitors have beenleft to the product design engineer. If the incorrect crys-tal and external capacitors are selected, it can lead to aproduct that does not operate properly, fails prema-turely, or will not operate over the intended temperaturerange. For product success it is important that thedesigner understand how an Oscillator operates inorder to select the correct of a Crystal appears deceivingly simple. Takefor example the case of a microcontroller.

AN826 DS00826A-page 2 2002 Microchip Technology Inc. OSCILLATOR BASICS Reduced to its simplest components, the oscillator con-sists of an amplifier and a filter operating in a positive

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  Basics, Oscillators, Crystal, Crystal oscillator basics, Oscillator basics

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