The main parameters of the crystal are nominal frequency, load capacitance, frequency accuracy, frequency stability and so on. The nominal frequency of the crystal is not the same, and the nominal frequency is mostly marked on the crystal housing. For example, the frequency of the crystal oscillator can reach more than 1000 MHz, and there are no nominal frequencies such as CRB, ZTB, Ja and other series, such as CRB, ZTB, Ja and so on. The

Load capacitance is the crystal of the two lead IC block internal and external all the useful capacitance and can be seen as the crystal in the circuit in series capacitor. The frequency of the vibration is different. The vibration frequency of the vibrator is different. Nominal frequency of the same crystal, the load capacitance is not necessarily the same. Because the quartz crystal vibrator has two resonant frequencies, one is the low load capacitance of the series vibrating crystal, and the other is the high load capacitance of the crystal oscillator in parallel. Therefore, the nominal frequency of the same crystal exchange when there is a need to request the load capacitor to one, can not take
Exchange, otherwise it will form electrical work is not normal.
Frequency accuracy and frequency stability: Because the function of the crystal is usually able to reach the usual electrical requirements, on the advanced equipment also need to have a certain frequency accuracy and frequency stability. Frequency accuracy ranging from 10 ^ (-4) to 10 ^ (-10) order of magnitude. The stability ranges from ± 1 to ± 100 ppm. This should be based on detailed equipment needs to select the appropriate crystal, such as communication network, wireless
Data transmission systems require higher demand for quartz crystal vibrators.
Therefore, the parameters of the crystal resolution of the crystal quality and function. In practice, according to the detailed request to select the appropriate crystal, because the performance of the crystal-like performance of the crystal is not the same, the higher the request for the more expensive, usually select the request can only be satisfied.