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Oscillators

637E21255C2T Application Field and Working Principle

Oscillators are used to generate a stable and usually periodic waveforms. They are widely used in electronic circuits, ranging from simple clocks, radio signal projects, loudspeaker systems to modern communication systems such as cellphones and computers. As an oscillator, 637E21255C2T is a type of voltage-controlled oscillator (VCO) with excellent phase noise and frequency stability characteristics. It is widely used in a variety of commercial and military applications including Aerospace, missiles, radar and Global Positioning System (GPS).

637E21255C2T oscillators are typically packaged in a 4.9 mm x 2.2 mm flat shrink Small Outline Package (SOP-16). They feature a low current consumption of less than 30 mA, a low power consumption of 1.2 W, and a high reliability of 0.999 years. The device also provides a wide operating temperature range of -20 to +85C and an output frequency range of 800 MHz to 1600 MHz. Operating temperature range and high-reliability makes the oscillator an ideal choice for critical or high-reliability applications.

637E21255C2T has a two-stage design, with the first stage (VCO) is made up of three comb stages plus an inverted control logic circuit. The oscillation frequency is then controlled by an integrated voltage regulator. The generated waveforms are accurately controlled by the applied voltage control signal.

The second stage is a frequency divider which divides the oscillation frequency of the first stage by a factor of two. This divider allows the user to obtain the desired frequency output, for example 800-1600 MHz. The output frequency of the second stage can be further divided with an external binary counter, such as a 74HC74. The output waveform of the divider is also between 1 MHz and 10 MHz, depending on the input voltage applied.

In summary, 637E21255C2T is an efficient voltage-controlled oscillator designed for critical and reliable applications. Its low current consumption, wide working temperature range, and high output frequency range make it suitable for a variety of commercial and military applications. Combined with an external binary counter, the oscillator can be used to generate stable waveforms at a wide frequency range.

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