The 20MHz crystal oscillator circuit sustains oscillation by taking a voltage signal from the quartz resonator, amplifying it, and feeding it back to the resonator. It provides clock pulses of 20MHz frequency. The popularity of the crystals is due to the low cost.
One of the most important traits of the crystal oscillator is that it exhibits very low phase noise. In the crystal oscillator, the crystal mostly vibrates in one axis, therefore only one phase is dominant. This property of low phase noise makes them particularly useful in telecommunications where stable signals are needed, and in scientific equipment where very precise time references are needed. The result is that a quartz crystal behaves like a circuit composed of an inductor, capacitor and resistor, with a precise resonant frequency.
Also check 8MHz Crystal Oscillator sold by Robocraze. The oscillator provides clock pulses of 8 MHz frequency and can be used as a UART clock. It allows integer division to common baud rates and is a common clock for AVR microcontrollers.
|Operating Temperature Range
|-10°C to +60°C
|10 x 4.4 x 3.3(mm)
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