SG-636PCE 4.9152MC: ROHS M

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Oscillators

Oscillators are an electronic component that creates an electrical signal at a specific frequency. SG-636PCE 4.9152MC: ROHS M is one example, which is a PECL (Positive Emitter-Coupled Logic) oscillator with an output frequency of 4.9152MHz. The device is designed to be RoHS (Restriction of Hazardous Substances) compliant, meaning it uses lead-free materials.

Application Field

The SG-636PCE 4.9152MC: ROHS M oscillator is most commonly utilized in applications demanding the highest levels of jitter performance. These may include radio frequency communication systems, video production equipment, digital audio and video broadcasting systems and complex medical equipment.

Working Principle

The oscillator works by converting an analogue input signal (a carrier frequency) to a digital output signal. This is done by using an Emitter Coupled Logic (ECL) circuit which controls the switching of two transistors, called emitter followers. During switching, the voltage of the output signal varies between two predefined levels. The size of the level difference and the switching frequency determines the output signal frequency value.

The frequency is determined by the capacitive and inductive reactance of the ECL circuit. To ensure the most precise and consistent output frequencies, an external crystal oscillator is typically used as the reference for the feedback loop.

In applications where frequency stability is of paramount importance a TNVC-780A voltage-controlled oscillator (VCO) can be used. This is a chip with a built-in crystal oscillator and can produce a very stable output frequency which is locked to a nominal input voltage.

In a direct drive configuration, the SG-636PCE 4.9152MC: ROHS M oscillator is also capable of providing clean and stable signals with long term performance. The circuitry, which includes two N-channel transistors, is primarily designed for power supply voltages between 4.6 and 5.5 V.

Conclusion

The SG-636PCE 4.9152MC: ROHS M oscillator is a versatile and high-precision electronic component designed to provide a reliable and stable output frequency. Its lead-free materials make it RoHS compliant, while the built-in transistors enable it to be used in a variety of applications. The VCO chip can also be used to enhance the frequency stability in demanding applications.

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