This article describes the characteristics of single crystal oscillator.
The quotation of the crystal oscillator has also gradually declined. Many electronic component purchasers are very skeptical. Why do the demand for the purchased crystal oscillator frequency are the same, and the quotation is so different?
1. Crystal oscillator type: The active crystal oscillator is a perfect oscillator, which is composed of a quartz crystal, a RC component and a transistor component. The passive crystal oscillator relies on the clock circuit or the crystal that cannot be oscillated by itself. The shallow crystal is that the active crystal oscillator has a voltage, and the passive crystal oscillator has no voltage. Because the internal structure is different, the active crystal oscillator is more expensive than the passive crystal oscillator.
2. Load Capacitance: Load capacitance refers to all the useful capacitors seen by the two pins of the crystal oscillator in the direction of the sensation circuit. The load is not the same as the resolution of the bomber frequency is different, usually the load capacitance of the MHZ frequency point is 12PF, 16PF, 20PF, 33PF, etc., 32.768khz load capacitance is 6PF, 9PF, 12.5PF, etc., the same crystal load capacitance does not It must be the same, the more commonly used on the same frequency, the cheaper the load capacitance.
3. Crystal frequency: It is also the nominal frequency of the crystal oscillator. Generally speaking, it will be marked on the surface shell of the crystal. Most of the marked words are neutral laser printing, such as: 11.0592mhz, 12.000mhz, 24.576mhz, 18.432mhz, etc. Sometimes manufacturers will also mark the code or directly without the word mark, like the cylindrical column crystal 32.768khz sometimes to omit the word in order to reduce the cost, then the need to look at the outsourcing is not similar words, if there are conditions, you can use the crystal vibration test Test it. In addition, the quotation does not mean that the higher the frequency, the more expensive. Of course, some crystal oscillators with partial frequency points will be relatively high, and the rarer the products, the higher the price.
4. Accuracy of crystal oscillator: The precision unit of crystal oscillator is PPM, which refers to the fault in the working temperature planning of crystal. The more common precision planning is ±10ppm, ±20ppm, ±30ppm, ±50ppm, ±100ppm. The crystal will exceed 100PPM. Some work is not normal, this can be said that the higher the accuracy, the higher the price.
5. Crystal package: The active crystal package is DIP-14 DIP-8, and the SMD chip type is 2025, 3225, 4025, 5032, 7050. The passive crystal package has a HC-49S HC-49U cylinder 3*8 2*6mm, and the patch type has hc-49smd 6035, 3225, 2025, 5032, 7050, 7045 and so on.
If you want to know more, our website has product specifications for single crystal oscillator, you can go to HongDa ELECTRONICS to get more information