Transcription of Crystal Oscillator Troubleshooting Guide - NXP
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Crystal Oscillator Troubleshooting Guide - NXP
Freescale Semiconductor AN3208. Rev. 0, 1/2006. Application Note Crystal Oscillator Troubleshooting Guide by: Sergio Garcia de Alba Garcin RTAC Americas 1 Overview 1. Table of Contents Overview .. 1. This document is a quick-reference Troubleshooting 2 Introduction .. 1. 3 Oscillator Configurations.. 2. Guide for solving Crystal Oscillator problems that might 4 Components in the Colpitts Configuration .. 3. be encountered when working with microcontrollers. 5 Components in the Pierce Configuration .. 3. 6 Crystal Overdriving .. 4. A practical explanation of the Pierce and Colpitts 7 Insufficient Loop Gain .. 5. oscillators used in Freescale microcontrollers and 8 Long Start-Up Time.. 5. recommendations to help solve common problems with 9 Temperature and Voltage Issues.
Crystal Oscillator Troubleshooting Guide, Rev. 0 Freescale Semiconductor 5 7 Insufficient Loop Gain Just as overdriving the crystal can be a problem, insufficient drive can al so be the source of many failures. For adequate loop gain, load capacito rs must be sized correctly, and R B and R S values must be appropriate in the Pierce configuration.
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