（OCXO恒温晶振内部结构图）

OCXO恒温晶振压控引脚可以接地吗？

答：如果不需要使用压控（Voltage Control）功能控制频率，建议该压控引脚接地（GND）。

OCXO恒温晶振引脚说明：

压控功能：

通过改变压控引脚电压，可实现对晶振输出频率的微调。如果不需要微调频率，建议压控引脚接地，以免压控引脚受到电磁杂波干扰，影响到晶振输出频率的稳定性。

OCXO恒温晶振参数解释说明：

HANDLING PRECAUTIONS FOR MODULES WITH EMBEDDED CRYSTALS

The built-in AT-cut crystal consists of pure Silicon Dioxide in crystalline form. The cavity in the built-in crystal package is evacuated and hermetically sealed in order for the crystal blank to function undisturbed from air molecules, humidity and other influences.

Shock and vibration:

Keep the crystal / module from being exposed to excessive mechanical shock and vibration. Genuway guarantees that the crystal / module will bear a mechanical shock of 5000 g / 0.3 ms.

The following special situations may generate either shock or vibration:

Multiple PCB panels – Usually at the end of the pick & place process the single PCBs are cut out with a router. These machines sometimes generate vibrations on the PCB that have a fundamental or harmonic frequency close to the resonance frequency of the crystal unit. This might cause breakage of crystal blanks due to resonance. Router speed should be adjusted to avoid resonant vibration.

Ultrasonic cleaning – Avoid cleaning processes using ultrasonic energy. These processes can damage the crystals due to the mechanical resonance frequencies of the crystal blank.

Overheating, rework high temperature exposure:

Avoid overheating the package. The built-in crystal package is sealed with a seal ring consisting of 80% Gold and 20% Tin. The eutectic melting temperature of this alloy is at 280°C. Heating the seal ring up to >280°C will cause melting of the metal seal which then, due to the vacuum, is sucked into the cavity forming an air duct. This happens when using hot-air-gun set at temperatures >280°C.