The main parameters of crystal oscillator are nominal frequency, load capacitance, frequency accuracy, frequency stability and so on. Different crystal oscillator nominal frequency is different, most of the nominal frequency is marked on the crystal oscillator shell. For example, the normal crystal oscillator frequency is 48kHz, 500khz, 503.5khz, 1MHz ~ 40.50mhz, etc. For special requirements, the crystal oscillator frequency can reach more than 1000mhz, and there are also some non-standard frequencies, such as CRB, ZTB, Ja and other series. Load capacitance refers to the sum of all effective capacitors inside and outside the IC block connected by two lead wires of crystal oscillator, which can be regarded as the serial capacitors of crystal oscillator in the circuit. Different load frequency determines the oscillation frequency of the oscillator. The load capacitance may not be the same for the crystal vibration with the same nominal frequency. Because the quartz crystal oscillator has two resonant frequencies, one is the series resonant low load capacitive oscillator, the other is the parallel resonant high load capacitive oscillator. Therefore, when the nominal frequency of the same crystal oscillator exchange must also require the same load capacitance, can not swap rashly, otherwise it will cause abnormal electrical work. Frequency accuracy and frequency stability: as the basic performance of ordinary crystal oscillator meets the requirements of general electrical appliances, it is necessary to have a certain frequency accuracy and frequency stability for high-grade equipment. The frequency accuracy varies from the quantum to the quantum. The stability varies from ±1 to ±100ppm. This depends on the specific equipment needs to choose the appropriate crystal oscillator, such as communication network, wireless data transmission and other systems need higher requirements of quartz crystal oscillator. Therefore, the parameters of crystal oscillator determine the quality and performance of crystal oscillator. In practical application, appropriate crystal oscillations should be selected according to specific requirements. Due to the different price of crystal oscillations with different performance, the higher the requirements are, the more expensive the crystal oscillations will be. Generally, the choice can be made as long as the requirements are met.
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