SIT9120AC-2C-25S

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Programmable Oscillators

Programmable oscillators consist of many different types of frequency generator circuits, programmable filters and dividers, phase-locked-loops and so on. They produce a very precise frequency that can be adjusted and controlled very accurately. Oscillators of this type in general use electric signals to regulate their output frequency. They are characterized by their phase noise, frequency accuracy and stability. SIT9120AC-2C-25S is one of the programmable oscillators.

SIT9120AC-2C-25S application field and working principle

SIT9120AC-2C-25S is a series of silicon based CMOS voltage controlled oscillator developed by SiTime. It is capable of being programmed with a wide range of frequencies from 2MHz to 125MHz and with different low-phase-noise characteristics. The device has a wide operating temperature range of -40°C to +85°C and is suitable for industrial, military and aerospace applications. The device can be used in applications such as synthesizers, digital circuits, clock signal generation, data recovery systems and PLL circuits.

The SIT9120AC-2C-25S works in the following way. First, it receives an external control voltage (Vctl) which is converted to a digital logic control signal by a high-speed comparator. The logic signal is then used to control the charge pump and oscillator circuit. The oscillator circuit produces a precise, low-phase noise signal at the required frequency. This signal is then multiplied by an all-digital PLL to produce an accurate, stable output frequency.

The output frequency can be controlled by changing the charge pump current, or by varying the control voltage applied to the device. In addition, the device provides an output enable pin which can be used to stop the output when it is not needed. This feature can also be used to reduce power consumption.

The SIT9120AC-2C-25S is a very useful device for many applications such as synthesizers, digital circuits, clock signal generation, data recovery systems and PLL circuits. It has a wide operating temperature range and can produce precise, stable frequencies with low-phase-noise characteristics.

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