550AH737M280DGR

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Oscillators

An oscillator is an electronic circuit that generates a periodically varying signal. Oscillators are used in virtually all electronic devices and are essential components of many electronic systems. The most common type of oscillator is the linear oscillator, which consists of an amplifier and a feedback element that controls the amplifier output.

550AH737M280DGR application field and working principle

The 550AH737M280DGR oscillator is a temperature-compensated, quartz-crystal oscillator circuit with a voltage-controlled oscillator (VCO). This oscillator is designed for use in applications such as process control and automotive systems where low power consumption, high performance, and compact size are essential. The oscillator is rated for operation from 0 to 100MHz with a maximum frequency stability of +/- 10 PPM. The precision tuning element used in this oscillator is a quartz crystal. The design of the oscillator can be tuned over the temperature range of -40 degrees Celsius to +85 degrees Celsius with a temperature coefficient of 0.005 PPM/°C.

At its core, the 550AH737M280DGR operates in a normal push/pull oscillator configuration, with a quartz crystal mounted at the center. A variable capacitor is connected to the crystal to allow precise tuning of the oscillator frequency. The output of the oscillator is buffered by an amplifier and provided as a single-ended TTL-compatible signal. The frequency of the output waveform can be controlled through the use of a VCO, which can modulate the crystal\'s frequency by applying an appropriate voltage to it. Furthermore, the reference voltage (Vref) that controls the VCO, along with the amplifier\'s temperature compensation, are adjustable with external trimming capacitors.

The reference voltage (Vref) is derived from an internal comparator and a bandgap reference voltage source. The VCO output is divided down by a two-stage divider to match the reference voltage. The amplifier is temperature-compensated by the use of an external NTC thermistor, connected to the amplifier\'s Vref pin. The amplifier is designed to be highly linear, minimizing distortion in the output waveform.

The 550AH737M280DGR can be used in a variety of applications such as motor control, low frequency signal generation, frequency synthesis, frequency embedding in power-line distributed systems, remote telemetry systems, RF synthesisers, and many other tasks. In these applications, the compact size and low power requirements, as well as the stability and accuracy over temperature, make it an excellent choice.

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