SIT3821AC-1D-25EH

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Programmable oscillators are sophisticated electronic components used to regulate the way an electrical signal oscillates in circuits. They are very useful in a range of diverse applications where an external signal input and/or a few adjustable parameters may be used to modulate the centre frequency and/or the shape of the generated waveform. The SIT3821AC-1D-25EH is a compact and high performance programmable oscillator, designed for applications such as cellular base-stations, motor drives, USB docks and consumer electronics.The SIT3821AC-1D-25EH is a programmable oscillator with Integrated Temperature Compensation Technology, designed to reliably regulate the oscillatory behavior of the signal in the presence of temperature variations. The device is available in a 5 x 7mm SMD package. It features very low noise, low jitter and extremely fast startup.The SIT3821AC-1D-25EH programmable oscillator consists of an electronic package containing several components including a variable frequency oscillator, a voltage-controlled oscillator, a temperature-compensated crystal, an integrated circuit, a switching-mode frequency synthesizer, and a frequency/phase control-pll. Its performance parameters are programmable and can be adjusted by external signals or by changing the values of the adjustable internal control parameters.The working principle of the SIT3821AC-1D-25EH is based on the integration of temperature and frequency compensation technologies. The device uses temperature compensation techniques, such as the use of a temperature-compensated crystal, in order to compensate for temperature-induced variations in the frequency of the oscillator. This ensures that the oscillations remain as regular and stable as possible across all temperatures.The SIT3821AC-1D-25EH also features a voltage-controlled oscillator (VCO) in order to convert digital control signals into an adjustable frequency signal. The output frequency of the oscillator can be accurately programmed either by a control voltage or by a serial digital control interface, such as I2C.The switching-mode frequency synthesizer is used to generate frequency and phase-shifted copies of the oscillatory signal. By varying the widths and periods of the frequency-shifted sub-oscillations, the frequency and phase of the main oscillator can be precisely tuned. The frequency-shifted copies of the main oscillatory signal can also be used to construct a phase locked loop (PLL), which allows the SIT3821AC-1D-25EH to be programmed to precisely phase-lock to an external reference signal.In conclusion, the SIT3821AC-1D-25EH is a very versatile and sophisticated programmable oscillator that can be used in a wide range of applications. Its integrated temperature compensation and frequency synthesis technologies ensure that the frequency of the oscillator remains as stable as possible regardless of temperature variations. Furthermore, its VCO and PLL features make it easy to program its output frequency and phase, respectively, in order to precisely control the behavior of the generated oscillatory signal.

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