SIT9005ACL2H-25DA

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Programmable Oscillators are a type of electronic components capable of generating precise, high-stability clock signals to serve many applications. One of them is SIT9005ACL2H-25DA, which is a high-frequency clock oscillator based on small-package surface mount technology. Its application field and working principle are discussed in this paper.

Application Field

SIT9005ACL2H-25DA features high-frequency output, low jitter and long-term stability, making it an excellent choice for many electronic products, especially those rely on time signals, such as network routers and switches, smartphones, computer motherboards, satellite receivers, data loggers, etc.

In detail, the SIT9005ACL2H-25DA is designed to generate ultra-low-jitter and low-VCO pull-in range clock signals at frequencies up to 1.25 GHz. With small package and tight EMI requirements, this oscillator is capable of meeting even the most stringent application in small form factors.

Working Principle

The SIT9005ACL2H-25DA\'s working principle is based on the principle of an electronic oscillator. An electronic oscillator is a device that generates sinusoidal signals of certain frequencies. It can be used for generating clock signals for different purposes. The SIT9005ACL2H-25DA is a programmable oscillator that works by generating output clock signals from an internal voltage-controlled oscillator (VCO).

The VCO consists of two parts: a charge pump and a varactor. The charge pump is responsible for increasing the bias voltage of the varactor, which is a voltage-sensitive semiconductor device. This is done by generating a negative current through the varactor, which is controlled by the level of its bias voltage. By changing the bias voltage of the varactor, the frequency of the output signal is adjusted. The frequency adjustment range is determined by the circuit design. For example, the SIT9005ACL2H-25DA is designed to operate with an input voltage ranging from 0 to 4.5 volts and an operating frequency range of 0.5 Hz to 1.25 GHz.

In addition to the use of VCO, the SIT9005ACL2H-25DA also features a programmable frequency-pull-in range. The pull-in range is set by adjusting two external resistors. The two resistors provide a bridge that controls the VCO\'s pull-in range. As the resistors are adjusted, they change the pull-in range of the VCO, allowing the user to adjust the clock frequency to fit the application precisely.

The SIT9005ACL2H-25DA also has a dynamic frequency control feature that is designed to ensure a constant frequency throughout its operating environment. The unit uses a frequency control loop to compensate for any frequency variations due to aging and temperature changes by continuously adjusting its output frequency. This feature further helps to ensure that the user can obtain clock frequencies with a high level of precision and stability.

Overall, the SIT9005ACL2H-25DA is a highly programmable and stable programmable oscillator, suitable for a wide array of applications. Its high-frequency output, low jitter, and long-term stability make it a great choice for any modern electronic device.

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