Oscillators are an important component of radio fre- quency (RF) and digital devices. Today, product design engineers often do not find themselves designing oscil- lators because the oscillator circuitry is provided on the device. However, the circuitry is not complete. Selec- tion of the crystal and external capacitors have been left to the product design engineer. If the incorrect crys- tal and external capacitors are selected, it can lead to a product that does not operate properly, fails prema- turely, or will not operate over the intended temperature range. For product success it is important that the designer understand how an oscillator operates in order to select the correct crystal. AN826 Crystal Oscillator Basics and Crystal Selection for rfPICTM and PICmicro Devices What temperature stability is needed? Author: Steven Bible Microchip Technology Inc. What temperature range will be required? Which enclosure (holder) do you desire? INTRODUCTION What load capacitance (CL) do you require? What shunt capacitance (C0) do you require? Oscillators are an important co……