SIT9120AC-2B2-25E161.132800G

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Oscillators play an essential role in providing a clock signal for timing and synchronization of processing, analogous and digital systems. As a kind of Oscillator, SIT9120AC-2B2-25E161.132800G is reliable and provides high accuracy and stability. This article will focus on its application field and working principle.

Application Field

SIT9120AC-2B2-25E161.132800G is a high-performance oscillator of SiTime’s Automotive Grade LVCMOS oscillator family, designed for high-temperature automotive applications with requirements for a wide frequency range. This oscillator is ideal for automotive applications such as Display Audio controllers, Media Oriented Systems Transport (MOST) transceivers, automotive cluster controllers, and short-range, high-speed data systems. It meets the specifications in Advanced Encryption Standard (AES), Controller Area Network (CAN-FD) and Local Interconnect Network (LIN).

This oscillator is designed to withstand harsh automotive environmental conditions with features such as vibration ratings up to 50G, temperature range -40°C to +125°C, and no frequency shifts or changes in performance over voltage or temperature.

Working Principle

The working principle of SIT9120AC-2B2-25E161.132800G is based on the combination of CMOS logic and quartz crystal resonator. When a quartz crystal is operated in the piezoelectric mode, external AC fields cause the crystal to generate an electrical voltage. This voltage, if amplified and chopped at the resonant frequency, generates a signal. The signal from the quartz crystal is amplified in the oscillator’s circuit, further filtered and processed, and finally output from the oscillator.

The oscillator uses a temperature compensated bias circuit to reduce variation in the frequency over temperature. The oscillator is designed with an internal bandgap to maintain tight frequency accuracy over a wide temperature range. The frequency is also digitally compensated over voltage and temperature. The signal output from the oscillator is an LVCMOS output with a spectral purity that meets the most demanding automotive application requirements.

Conclusion

To sum up, SIT9120AC-2B2-25E161.132800G is a reliable and accurate high-performance automotive grade LVCMOS oscillator. It is designed for applications requiring a wide frequency range and a high accuracy. It is designed with an internal bandgap to maintain tight frequency accuracy over a wide temperature range. Moreover, its signal output from the oscillator is an LVCMOS output with a spectral purity that meets the most demanding automotive application requirements.

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