The action of oscillator of brief analysis crystal and choice ask
[introduction] about crystal oscillator, its English name is Quartz Crystal Oscillator, namely the brilliant that we often say brace up, of course cough up, also have call its active brilliant brace up. It can produce central processor (CPU) executive instruction place must clock frequency signal, the execution of all CPU instructions is to build what go up in this foundation, clock signal frequency is taller, the traversal speed of CPU is normally faster also.
If include the electronic product of CPU, include source of a clock at least, even if outside cannot see actual oscillating circuit, also be in chip interior by compositive, it is called the heart of circuit system.
The action of crystal oscillator is to be able to be a system to provide fundamental clock signal. Between a system, all component all are used same a crystal oscillator, maintain departmental synchronism in order to go to the lavatory. Between the communication system of one part, fundamental frequency and radio frequency can use different crystal oscillator, the method that can adjust frequency through the electron at this moment keeps synchronous.
This shows, crystal oscillator is able to apply between a lot of electron products. To assure an electron the product can move normally, the choice of crystal oscillator also is a job that deserves consider very much. The requirement that chose crystal oscillator at 5 o’clock was summed up below, in order to offer reference.
1, the exterior detects. Written language of product exterior sign is viewed outside passing an inspection whether clear standard, surface exists crack, bring a foot to go up whether already solder crosses stannum. If discovered from appearance the product is not perfect, should not take use.
2, frequency. The client chooses suitable frequency according to product requirement, frequency is most important, cannot change casually. Below the case that must pass eligible test and verify to perhaps be passed in professional test, reentry talks things over all right. If the frequency of actual circuit requirement is 4.43MHz, below the circumstance that does not have supply of goods, do not change casually about the same frequency will use.
3, crystal oscillator outputs mode. When choosing crystal oscillator, the crystal oscillator that should need considering circuit outputs a type, general component outputs for n and differ minute of output: CMOS is the commonnest n output type; And LVPECL and LVDS are type of common the output that need branch. Different output type cannot alternate casually, differ cent to follow common crystal oscillator especially.
4, model. The type that case seeing Qing Dynasty wants when use crystal oscillator labels, model made clear the multinomial parameter index of crystal oscillator, come according to the client’s product requirement corresponding product parameter, find out corresponding model and detailed parameter norms book. If choice of crystal oscillator model is undeserved, will cause applied error.
5, the generation of crystal oscillator changes a fundamental. If oscillator of a crystal damaged, in principle should choose archetypal date brilliant brace up era is changed. When doing not have archetypal date, after best course checks, the crystal oscillator that can consider to use other type or other type will replace.