Regarding the crystal oscillator, its English name is Quartzcrystaloscillator, which is the crystal of our often called, of course, and it is called source crystal. It can generate a clock frequency signal necessary for a central processor (CPU) execution instruction. The execution of all instructions of the CPU is based on this basis. The higher the frequency of the clock signal, the faster the CPU runs.
As long as it is an electronic product containing the CPU, at least one clock source is included, even if the actual oscillation circuit is not seen, it is integrated inside the chip, which is called the heart of the circuit system.
The effect of the crystal oscillator is capable of providing a base clock signal in the system. Among a system, there is a common use of the same crystal oscillator, which is for convenience to maintain each part. Among a part of the communication system, the fundamental frequency and radio frequency use different crystal oscillators, at this time, it is maintained by the method of electron adjusting the frequency.
It can be seen that the crystal oscillator is used in many electronic products, and in order to ensure that the electronic product is functioning properly, it is also worth a thing on the selection problem of the crystal oscillator, and summarizes the five-point selection crystal. The oscillator requirements for reference.
1. Appearance test. By checking whether the appearance of the product is clearly specified, whether there is a crack in the appearance surface, whether it has been soldered on the pin. If the product is not perfect from the outside, it should not be used.
2, frequency. The customer selects the appropriate frequency based on product needs, the frequency is most important, and cannot be replaced casually. Be sure to pass the qualified verification or professional testing, negotiate. If the actual circuit requires 4.43MHz, do not replace the almost frequencies in the case of no supply.
3, crystal oscillator output mode. When selecting a crystal oscillator, take into account the crystal oscillator output type required for the circuit, generally distinguished level output and differential output; level output: CMOS is the most common output type, and differential output: LVPECL, LVDS is commonly used Differential output type. Different output types may not be cascaded, especially differential with ordinary crystal oscillators.
4, model. Applying crystal oscillators To see the model tag of the outer casing, the model indicates a number of parameter indicators of the crystal oscillator, and the product parameters are found according to the customer's product needs, and find out our model. Then send a detailed parameter specification to the customer confirmation, it can be shipped normally. If the crystal oscillator model is selected, it will result in an application error.
5, the principle of change of the crystal oscillator. If a crystal oscillator is damaged, it should be used in principle to select the prototype number crystal. When there is no prototype, it is preferred to be tested, and it can be considered to be replaced with other models or other types of crystal oscillators.
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