ECX-H22BN-74.250

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Oscillators are used widely in different fields of technology from sensing, control and communications. ECX-H22BN-74.250 is one kind of oscillator, and it is widely used to generate desired frequency signals. This article will introduce its application field and working principle.

Application field
ECX-H22BN-74.250 oscillator is a voltage-controlled KHz frequency swing oscillator. It is a cost-effective and small size chip for automotive audio, satellite navigation and other types of communications systems. It can be used for frequency modulation, frequency synthesis, AGC audio, cell phone base station, hi-fi audio and other general-purpose frequency control. It also can be applied in oscillator circuits like voltage controlled oscillators, frequency synthesizers, programmable divider, etc.

Working Principle
The ECX-H22BN-74.250 oscillator works based on the principle of variable capacitance. Its main components are the oscillator core with frequency-dependent components (vibrator, trimmer and charge pump) and an internal voltage divider. The vibrator consists of two sub-oscillators, one for amplitude modulation and one for frequency modulation. The frequency divider is used to divide the input frequency by a certain factor. The logic input is used to control the charge pump and trimmer capacitor, thus controlling the output frequency.

The trimmer capacitor together with the charge pump and the oscillator core determine the oscillation frequency. When the charge pump output is active, the vibrator is frequency modulated. The trimmer capacitor is used to adjust the output frequency. When the logic input is low, the charge pump output becomes inactive, and the oscillation frequency will increase proportional to the increased charge pump voltage. The frequency validation input is used to set the output frequency. When the logic input is high, the trimmer capacitor is disconnected, and the oscillation frequency will then be determined by the fixed capacitance of the vibrator.

In conclusion, ECX-H22BN-74.250 is a voltage-controlled KHz frequency swing oscillator which is widely used for frequency modulation, frequency synthesis, AGC audio, cell phone base station, hi-fi audio and other general-purpose frequency control. It works based on the principle of variable capacitance, mainly composed of oscillator core, frequency-dependent components and an inner voltage divider.

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