SIT8008BIA8-18S

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Programmable Oscillators

SIT8008BIA8-18S is one type of programmable oscillator that come in a variety of shapes and sizes. This oscillator offers its users adjustable frequency, load impedance, phase shift, and temperature compensation. It is best suitable for use in applications requiring fine tuning and phase-shifting such as in phase lock loop (PLL) circuits, tuned amplifier circuits, as well as some frequency synthesizers. The main application field and operating principle of SIT8008BIA8-18S are discussed in more detail below.

Application Field

Due to its multi-functional properties, the SIT8008BIA8-18S can be used in a broad range of applications, including communication, computer and peripheral, control, audio and video devices, etc. The circuit design itself is simple, only usually consisting of a few passive components such as resistors and capacitors. This makes it a great choice for cost-sensitive applications. Additionally, the programmable oscillator\'s small size of 18S allows for easy integration into various existing products. It is an ideal hub for use in applications needing fine-tuning and phase-shifting.

The SIT8008BIA8-18S has wide frequency range, adjustable frequency accuracy of up to 0.2% tolerance, phase shift of up to ±180°, load impedance adjustment up to 15Ω, temperature compensation of up to ±20ppm, and adjustable output characteristics. Users have the ability to program the frequency, phase shift, and other characteristics such as current drain and load impedance. This gives the SIT8008BIA8-18S the added advantage of supporting many oscillation modes, such as those needed for quartz crystal oscillators and non-sense-resonator oscillators.

Working Principle

The SIT8008BIA8-18S oscillator works on the principle of phase-locked loop (PLL) and consists of two parts: the reference oscillator and the voltage-controlled oscillator (VCO). The reference oscillator provides the input frequency, which is then fed to the VCO and compared to the output frequency. The difference between the two frequencies is called the phase error signal, which is then sent back to the VCO. Finally, the VCO adjusts its frequency and level to match the reference frequency.

The SIT8008BIA8-18S also uses a Current-Voltage Adjustable (CVA) circuit, which is employed to control the output frequency and allow for precise tracking and frequency control. The CVA consists of several components such as a resistor, a capacitor, a diode, and a voltage-controlled voltage source (VCCS). When the output signal from the oscillator varies, the CVA circuit adjusts the voltage from the VCCS accordingly to ensure the desired frequency.

The SIT8008BIA8-18S also have adjustable clock buffer circuits, which are used to boost the output signals. The internal clock buffer circuit consists of a PNP transistor, which is driven by an output signal from the oscillator. The output signal is then sent to the positive-output terminal. Also, the SIT8008BIA8-18S can be adjusted according to the temperature change, so that the frequency and operating characteristics remains unchanged.

Conclusion

The SIT8008BIA8-18S is a high-performance programmable oscillator that can be used in a wide range of applications. It offers adjustable frequency, load impedance, phase shift, and temperature compensation for precise tuning and effective operation. The use of PLL and CVA architectures helps ensure reliable operation, while the adjustable clock buffer provides extra protection and buffering. The small size and low cost makes the SIT8008BIA8-18S an ideal choice in cost-sensitive applications.

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