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AN2441 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN2441 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 14 page ![]() Contents AN2441 2/14 Contents 1 Oscillator theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Quartz crystal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Frequency vs. mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Direct drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Pierce oscillator design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 Amplifier element: 74V1GU04 ST inverter + feedback resistor . . . . . . . . . 7 3.2 C1 and C2 capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.3 Rs resistor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 16-MHz oscillator example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 PCB hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 |
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