181M-52LF Integrated Circuits (ICs)

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Clock / Timing - Clock Generators, PLLs, Frequency Synthesizers

The 181M-52LF is a clock synthesizer and voltage-controlled oscillator (VCO) that is tuned with fixed external components. The clock generator is a single-phase quadrature oscillator with fine frequency resolution, suitiable for frequencies up to 1.2 GHz. This device is capable of providing outputs with a frequency resolution of 0.25%, and the user has the option of internally setting the frequency resolution to 0.01%.

Application Field

The 181M-52LF is a perfect solution for applications requiring high frequency resolution, such as Wi-Fi, cellular and other communication applications, and medical imaging systems. Additionally, the device can be used for measurement systems and other applications requiring precisely tuned frequencies.

Working Principle

The 181M-52LF consists of two main blocks; a voltage-controlled oscillator and a frequency divider. The voltage-controlled oscillator consists of a differential amplifier, varactor and reference oscillator, which are designed to generate a signal in response to changes in an external voltage. The output of this oscillator is divided down to a lower frequency by the frequency divider circuit, which consists of a divide-by-2 flip flop. The output of this flip flop is fed back to the input of the voltage-controlled oscillator, completing the closed loop system.

The oscillator is tuned by adjusting the external varactor with a variable resistance device. The varactor adjusts the capacitance of an internal oscillator, affecting its frequency. By adjusting the resistance setting of the variable resistance device, the capacitance of the varactor can be tuned, which in turn tunes the frequency of the oscillator. To ensure accurate frequency control, a feedback loop is designed that enables the frequency of the oscillator to be precisely adjusted.

The 181M-52LF also contains a control register, which can be programmed to adjust the device’s frequency resolution. The frequency resolution of the device can be adjusted from 0.01% to 0.25%, allowing the user to choose the accuracy necessary for their particular application. Additionally, the device contains a power-on reset circuit, which can be used to reset the device if power is lost.

In summary, the 181M-52LF is a clock generator and voltage-controlled oscillator that is tuned with fixed external components. It has a frequency resolution of 0.01% to 0.25%, making it suitable for applications requiring highly accurate tuning. The device contains a control register that can be programmed to adjust the device’s frequency resolution, and a power-on reset circuit that can be used to reset the device if power is lost.

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