SIT9005ACU1G-XXDK

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Programmable Oscillators is versatile frequency sources,and it can be used to generate a wide range of frequencies from a static frequency source.SIT9005ACU1G-XXDK is a typical such oscillator that is widely used in today’s circuit design.

Applications

SIT9005ACU1G-XXDK can be used wherever a digital clock signal is required. It is typically used in digital processors, such as microprocessors and microcontrollers, to provide the basic frequency from which all other related frequencies are generated. This includes meeting the timing constraints of communication buses such as USB, Ethernet, PCI Express, and so on. It can also synchronize the frequency of different bus protocols for power supply sequencing and clock generation for synchronous applications.SIT9005ACU1G-XXDK is weakly refereed and ideal for use in applications that require moderate frequency stability.

Working Principle

SIT9005ACU1G-XXDK works based on the principle of phase locked loop (PLL) phase detection technique. This technique locks the oscillator’s frequency to the reference signal. The frequency is determined by the reference signal and the reference signal is generated by the oscillator itself. The process of locking the frequency is an iterative process and one iteration lasts for some cycles.The frequency of the oscillator is adjusted based on a comparison between the oscillator\'s frequency and the reference signal. The frequency is adjusted after every iteration by using a digital PLL to increase or decrease the frequency. The digital PLL adjusts the capacitance of the oscillator\'s tank circuit and this change in capacitance results in a change in the oscillator\'s frequency.

SIT9005ACU1G-XXDK consists of a voltage-controlled oscillator (VCO) and a PLL. The PLL consists of two major components, a phase detector and a charge pump. The phase detector detects the phase difference between the VCO output and the reference signal, and then sends the information to the charge pump. The charge pump then increments or decrements the frequency of the VCO in response to the phase difference.The output frequency can be adjusted by applying a voltage to the precision voltage-controlled resistor (VR) of the oscillator. Thus, the frequency range can be extended by adding a voltage divider to the precision VR.

Conclusion

In summary, SIT9005ACU1G-XXDK is a programmable oscillator that is suitable for use in processing applications and digital communication buses. It works based on the PLL technique and is able to generate a wide range of frequencies from a static source. It can synchronize the frequency of different buses for power supply sequencing and clock generation for synchronous applications. It is also adjustable with a voltage divider and its frequency range can be extended by increasing the voltage range.

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