Quartz crystal precision is not only the crystal power supply voltage changes, crystal load capacitance of its also have a certain impact, together with the external environment and improper use will also affect the accuracy of the crystal.
Manufacturers in the use of crystal time, often encounter these questions:
First, the acquisition of the crystal in the circuit to match the ambition, resulting in the use of the effect of less security; Second, the crystal in the commodity circuit temperature floating too much, a serious impact on the function of quartz crystal. So the engineer should request a stable power supply voltage tolerance and load capacitance to check the crystal function, together with the external environment elements should also be taken into account, to accurately select the crystal. So thoroughly thoughtful and accurate use of crystal, can reduce these negative effects to the minimum range.
Engaged in crystal career since the discovery of many customers prefer to choose high-precision quartz crystal (and even customers within 5ppm), do not want to let the project to adjust the circuit board on the other meta-equipment matching degree, not knowing the original crystal precision function is subject to external Environmental impact.
In addition to the demand for external power supply equipment, we must consider its power consumption. The introduction of 3.3V of goods will certainly match the 3.3V voltage in the operation of the crystal. The lower voltage allows the goods to operate at low power. Today, the large metro market is sold in the appearance of the chip is 3.3V voltage operation. Need to remind us
Is: the original crystal around the other circuit, the environment does not match is likely to affect the crystal precision
So that the majority of customers in the choice of crystal friends, must be in the match to the premise of the environment!