What are the causes of crystal vibration?
2024/07/23
If the crystal oscillator does not vibrate, you can try to arrange and combine the following aspects to find the links that are prone to problems, and it is easier to find out the reasons for the lack of vibration by combining your own problems.
1. Crystal excitation power
We all know that the quartz crystal is a passive component, mainly by the IC to provide a certain amount of excitation power will work properly. So, this incentive power is an important part of the factory. If the excitation power is too low, the crystal oscillator will not easily generate signals and will not easily vibrate. However, if the excitation power is too high, over-excitation will be formed, which will easily cause the damage of the quartz chip and cause the phenomenon of stopping vibration. To solve the problem of crystal vibration, at least the following three elements should be tested: oscillation frequency (frequency matching), oscillation margin (negative impedance) and excitation power.
2. Crystal brand and load capacitance
The load capacitance is very important. The load capacitance refers to the sum of all effective capacitances inside and outside the IC block connected to the two leads of the crystal oscillator. The brand of crystal oscillator is also one of the factors that cannot measure vibration. The original [sensitive word] crystal oscillator brand is still relatively guaranteed. Such as EPSON clock chip RX8010SJ
3. Grounding mode of crystal oscillator pin
The shell of the crystal oscillator is made of metal. When packaging, the pad can be made into a mechanical pad and suspended in the air. The top of Vanke is fixed with iron wire and then grounded (grounding is mainly to avoid electromagnetic interference of circuits, because some circuits are not reasonable in wiring, which is easy to cause electromagnetic interference and cause crystal oscillator problems)
4. Reduce the heating time during crystal welding
Check whether the welding temperature of the crystal oscillator will be high, causing the second damage of the crystal oscillator. Generally, the welding temperature is about 250 degrees or lower, not more than 300 degrees. If these are within the scope of the requirements, it is necessary to consider whether there are other reasons.
5. Use active crystal
The active crystal oscillator is used, and the active crystal oscillator is a built-in circuit, so there is no circuit matching problem, which greatly avoids the occurrence of the crystal oscillator vibration problem. This is one of the ways to solve the problem of crystal vibration!
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