Crystal oscillations, used to generate pulses, have their theoretical roots in "high-frequency electronic circuits". In "high frequency electronic circuits", it is the theory and circuit of high frequency oscillator, transmit, receive, modulation, demodulation and so on.
The oscillation frequency of a high frequency oscillator, depending on the value of the LC in the circuit, crystal oscillator, is used as L. The shape of the quartz crystal determines its frequency oscillation when it represents L. This value is extremely stable, so crystal oscillator is widely used.
When we use the SMT crystal oscillator we usually encounter the following situation. The four-legged SMT crystal oscillator does not know how to distinguish the pin position. There are many types of active crystal oscillator, and the pin definition of each type is different, and the connection method is also different, now I introduce the active crystal oscillator pin identification, for the convenience of you: a point marked as 1 pin, counterclockwise (pin down) is 2, 3, 4 pin respectively. Common usage: one foot suspended, two feet grounded, three feet connected to output, four feet connected to voltage. On the front of the word, from a bit of the foot, counterclockwise are: NC, GND, CLKOUT, VCC. (For specific correlation, please refer to YXC Yangxing official website "3225 Definition of Passive Crystal Oscillator Pin") The difference between the four and two feet of SMT crystal oscillator, and the two feet are called crystal, i.e. passive crystal oscillator. The oscillator of the four-legged patch is called crystal oscillator, which is active crystal oscillator. Active crystal vibration is easy to start, because there is no need for additional auxiliary devices, so the work is more stable, in addition, it needs an external power supply. The four pins are generally power supply, ground, clock output and empty pin respectively. When connected, the output end can be connected to the clock end. SMT crystal oscillator is mainly used for the clock module in the circuit to provide the corresponding clock reference, common applications are mainly embedded design, such as FPGA, DSP and other development board.
The oscillation frequency of a high frequency oscillator, depending on the value of the LC in the circuit, crystal oscillator, is used as L. The shape of the quartz crystal determines its frequency oscillation when it represents L. This value is extremely stable, so crystal oscillator is widely used.
When we use the SMT crystal oscillator we usually encounter the following situation. The four-legged SMT crystal oscillator does not know how to distinguish the pin position. There are many types of active crystal oscillator, and the pin definition of each type is different, and the connection method is also different, now I introduce the active crystal oscillator pin identification, for the convenience of you: a point marked as 1 pin, counterclockwise (pin down) is 2, 3, 4 pin respectively. Common usage: one foot suspended, two feet grounded, three feet connected to output, four feet connected to voltage. On the front of the word, from a bit of the foot, counterclockwise are: NC, GND, CLKOUT, VCC. (For specific correlation, please refer to YXC Yangxing official website "3225 Definition of Passive Crystal Oscillator Pin") The difference between the four and two feet of SMT crystal oscillator, and the two feet are called crystal, i.e. passive crystal oscillator. The oscillator of the four-legged patch is called crystal oscillator, which is active crystal oscillator. Active crystal vibration is easy to start, because there is no need for additional auxiliary devices, so the work is more stable, in addition, it needs an external power supply. The four pins are generally power supply, ground, clock output and empty pin respectively. When connected, the output end can be connected to the clock end. SMT crystal oscillator is mainly used for the clock module in the circuit to provide the corresponding clock reference, common applications are mainly embedded design, such as FPGA, DSP and other development board.
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