511ECA125M000AAGR

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Oscillators

The ECA125M000AAGR is a type of oscillator, specialized as a voltage-controlled crystal oscillator (VCXO) providing high-frequency signal accuracy and stability under dynamic load, operating environments or voltage current changes. It combines robust features of the VCXO with a high-frequency, low-noise quartz crystal, offering superior capability to other types of oscillators for a wide variety of applications.

Application Field

The ECA125M000AAGR is typically applied in communication systems: radio, mobile, WiFi, industrial applications and Ethernet systems; embedded systems, digital signal processing backplanes; optical networks, storage systems, and swithcgear routers. These applications require wide-ranging accurate, stable frequency control in an ultra-small, easy-to- use package. It finds particular use in digital loop-backs for telecommunications applications, as it provides long-term frequency stability, wide temperature range, and low jitter to reduce the effects of errors in digital communications.

Working Principle

The VCXO ECA125M000AAGR is based on an AT-cut quartz crystal, and an electro-mechanical transducer to convert actuating voltage into dynamic stresses that can be applied to the crystal. The crystal generates an output signal in the form of a sine wave which is phase-coherent with the applied voltage. In a predictable, repeatable fashion, the frequency of the sine wave output will vary based upon the amplitude of the actuating voltage.

In a standard circuit configuration, the positive terminal of a DC voltage source is connected to the transducer. The transducer will then convert the applied voltage to a mechanical stress applied to the quartz crystal core element, thus varying its natural frequency of oscillation. The transducer translates the electrical back-action to a piezoelectric effect, resulting in a frequency shift that is proportional to the supply voltage.

The output sine wave signal is then passed through a fixed-value buffer amplifier to provide a low output impedance in order to drive an oscillator circuit. The adjustment maximum range of a VCO is set by the final component in the chain: a gain-compensating amplifier that serves to buffer the output signal.

The output signal frequency of this oscillator is stable over negative temperatures from -110°C to 85°C, with frequency variation of -5 ppm/°C over the temperature range. The unit offers a wide range of frequency selections, with its operating voltage specification range of 2.4 Vdc to 13.2 Vdc.

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