MB88155PFT-G-111-JN-ERE1 Integrated Circuits (ICs)

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MB88155PFT-G-111-JN-ERE1 Application Field and Working Principle

MB88155PFT-G-111-JN-ERE1, also known as a VXCO (Voltage-controlled Crystal Oscillator) or VCXO, is a crystal oscillator (XO) based on a quartz crystal. It further applies the principle of a digital-analogue frequency divider in order to generate signals of frequencies other than those available from the quartz crystal itself. This allows for the creation of frequency signals easily adjustable in small increments.

Applications

This type of oscillator is primarily used in data communications, digital signal processor (DSP) based applications, and digital logic circuits to produce clock pulses of relatively low frequency. It is also used in wireless communications, such as phase-locked loop (PLL) or direct digital synthesizers (DDS) systems to allow the users to track frequency changes of the environment and further enhance the system\'s performance.

Working Principle

VXCO typically consists of a quartz crystal tuned to oscillate at the desired frequency, such as 8MHz, a frequency doubler to generate a 16MHz signal, and a frequency divider to divide the 16MHz signal into eight output signals, such as 1MHz, 2MHz, and 4MHz. The double frequency output is used as the reference and divided down to the desired frequency using a binary implementation of a digital-to-analogue converter (DAC). The frequencies of the output signals are adjusted by controlling the output of selected digital logic signals in the divider circuit.

All the digital logic signals are then converted to analogue voltages and applied to the XO to compete the operation. This means that the desired output frequencies are obtained by adjusting the digital logic signals to change the ratio of the digital frequency. In this way, it is possible to generate frequency signals which can be adjusted in very small increments.

Conclusion

The MB88155PFT-G-111-JN-ERE1 VCXO is a crystal oscillator that is suitable for use with data communication, digital signal processor based applications, and digital logic circuits. This oscillator can produce signals at different frequencies and the desired frequencies can be adjusted easily by controlling the output of selected digital logic signals in the divider circuit. The MB88155PFT-G-111-JN-ERE1 VCXO is therefore a great choice for any application where frequency adjustment is required.

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