Release date:2020-09-21
With the rapid development of information technology, miniaturized products are becoming more and more popular. The same is true for the crystal oscillator industry. Today, more and more electronic devices choose to use small and light chip crystal oscillators, and the use of plug-in crystal oscillators is gradually shrinking. Today we will talk about how to distinguish the pin positions of the chip crystal oscillator.
1. What is a chip crystal oscillator?
The crystal oscillator we often mention is one of the types of quartz crystals. Quartz crystal resonators, quartz crystal oscillators, and quartz crystal filters are all quartz crystal components. Quartz crystal is a type of piezoelectric crystal. When a piezoelectric crystal is squeezed or stretched in a specific direction, different charges will be generated at its two ends. According to different effects, it can be divided into positive piezoelectric effect and inverse piezoelectric effect. SMD crystal oscillators are mainly used in clock modules to provide corresponding clock references. Common applications are mainly embedded designs, such as FPGA, DSP and other development boards.
2. The similarities and differences between passive crystal oscillator and active crystal oscillator pins
Common SMD crystal oscillators are mainly divided into passive crystal oscillators and active crystal oscillators; passive crystal oscillators generally have no direction, but have pins, then how to distinguish between passive crystal oscillators and active crystal oscillators Where's the device? The 2-pin SMD crystal oscillator must be a passive crystal oscillator, the 4-pin SMD crystal oscillator may be a passive crystal oscillator, or it may be an active crystal oscillator, a SMD crystal oscillator with 4 pins or more It must be an active crystal oscillator.
3. How to distinguish the pin direction of the chip crystal oscillator?
Passive crystal oscillators usually have no direction. For a four-pin passive crystal oscillator, only two pins are functional pins, and the other two pins are suspended for connecting to GND; for an active crystal oscillator, under normal circumstances, the pin direction will be printed on the print, that is, the lower left corner one point.
So the above is what we are going to share today. If you have any supplements or other questions, please contact our company!
