SIT9120AC-1CF-25E148.500000X

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Oscillators are essential components in many electronic systems that require a steady and predictable waveform as an output or as a timing reference. Some of the most common applications include radio transmitters and receivers, radar systems, television broadcast systems and computing systems, to name a few. Among the wide variety of available oscillators, SIT9120AC-1CF-25E148 is an example of a crystal oscillator that operates in the frequency range of 500 kHz.

Overview

SIT9120AC-1CF-25E148 is a series of modified “Full Size” oscillators designed to be used in military and commercial applications in the frequency range of 500 kHz. These oscillators use a quartz crystal in a parallel resonant circuit as the resonant element, which is stabilised by two external capacitors, referred to as “load capacitors”. This type of oscillator allows for a more accurate and reliable frequency output and it has a lower power dissipation compared to other types of oscillators.

Design

The oscillator consists of a quartz crystal that is connected in parallel with two load capacitors and an amplifier stage. The quartz crystal determines the oscillator frequency with a characteristic called “load capacitance”. The load capacitance must be chosen carefully to guarantee the optimal frequency stability with the desired frequency output. A typical range of load capacitances ranges from 20 pF to 40 pF.

The amplifier stage is an integral part of the oscillator to help drive the crystal. This stage should be designed to provide correct amplification to the crystal to ensure reliable and stable oscillation. Without it, the oscillator is incapable of driving the crystal.

The output stage produces the required waveforms for the different types of output signals. The circuit topology and component selection depends on the application requirements. Most oscillators feature a CMOS power output, a sine wave output, a TTL output and an ECL output.

Features

One of the most appealing features of the SIT9120AC-1CF-25E148 series is their high accuracy and stability, with a typical frequency tolerance of just 2.5ppm (-10 to 70°C). They offer excellent jitter performance with a maximum of 20ps peak-to-peak pulse jitter and a phase noise of -150dBc/Hz at 10kHz offset. The operating temperature range is from -40°C to +85°C.

The oscillators are RoHS compliant and are available in several standard package configurations, such as through-hole (3 pin or 4 pin) and surface mount (2 pin or 3 pin). The through-hole packages are also available with connection posts for the power and ground pins.

Application Field

SIT9120AC-1CF-25E148 has a frequency range of 500 kHz, making it a suitable choice for most applications. It can be used for any type of electronic system that requires a steady and predictable waveform as an output, such as radio transmitters and receivers, radar systems, television broadcast systems and computing systems. The oscillators are also suitable for other applications such as medical imaging, industrial control systems, aerospace systems, and test and measurement equipment.

Working Principle

The quartz crystal inside the oscillator acts as the resonant element, which oscillates at the desired frequency. It is put into resonance by external load capacitors, which also help to stabilise it. As the frequency is determined by the quartz crystal, it must be chosen and load-tuned correctly to ensure optimal performance.

The amplifier stage amplifies the quartz crystal’s output and supplies the required power to drive the quartz crystal at the desired frequency. The output stage produces the desired waveforms for the different output signals. The frequency and load capacitance must be designed correctly to guarantee proper operation of the oscillator.

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