DSC1103CI2-074.2500T

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Oscillators

Oscillators are electrical circuits used in a variety of applications, from generating frequency reference signals used in radio receivers and transmitters, to providing the time basis for digital instrumentation and embedded systems, to controlling the speed of motors and other machinery. One type of oscillator, the DSC1103CI2-074.2500T, is used in a variety of telecommunications and industrial control applications.

DSC1103CI2-074.2500T Application Field

The DSC1103CI2-074.2500T is a type of crystal oscillator, also known as an AT-cut oscillator. The device is capable of providing an output frequency of 74.2500 MHz, with a temperature stability performance of +/- 25 ppm over the temperature range of -30C to +85C. It is suitable for a range of high frequency applications, such as mobile communication, satellite ground stations, radar tracking, and satellite positioning systems. Additionally, the oscillator provides extremely low levels of phase noise, hence it is suitable for use in systems that require a very precise time reference signal.

Working Principle

At the heart of the oscillator is a piezoelectric crystal, which is typically cut from a single piece of quartz. The crystal is a dielectric material, meaning it has the ability to store and release electrical energy. When electrical energy is applied to the two metal electrodes attached to the crystal, an electrostatic field is created. This field causes a mechanical vibration of specific frequency, which is determined by the size and shape of the crystal. The vibrating crystal generates an AC electric current, which can then be rectified to produce a DC voltage.

The oscillator uses an amplifying stage to boost the signal generated by the crystal to a usable level. Depending on the design of the oscillator, the amplifying stage may consist of a single transistor or an integrated circuit operating as a circuit or circuit combination. This amplifying stage also serves to shape the waveform of the oscillating signal. Once a suitable output voltage is achieved, the signal is fed back into the crystal for further amplification.

The oscillator then uses a PLL (phase-locked loop) or a DLL (delay-locked loop) to further refine the oscillation frequency and keep it stable over time. This involves sensing the frequency of the output signal and adjusting the voltage applied to the crystal accordingly. This keeps the output waveform accurately locked to the resonant frequency of the crystal, producing a precise frequency output.

Conclusion

The DSC1103CI2-074.2500T crystal oscillator is a type of oscillator designed for high frequency applications where accuracy and performance is essential. It uses a piezoelectric crystal to generate an output frequency of 74.2500 MHz, and is designed for use in a wide range of telecommunications, industrial, and consumer electronic applications. The oscillator is also designed to provide low levels of phase noise and very good temperature stability. Finally, the oscillator relies on a PLL or a DLL to maintain the stability of the output frequency over time.

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