SI51218-A07980-GMR

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SI51218-A07980-GMR is a clock generator designed to provide high accuracy and stability for modern applications, such as synchronous Ethernet, high-speed communication protocols, and high-end video applications. In order to keep up with ever increasing timing requirements, the SI51218-A07980-GMR offers a variety of features, including precise phase locked loop (PLL) synthesis, high switching frequency, and low phase noise performance.

At the core of the SI51218-A07980-GMR is a PLL frequency synthesizer, which allows the user to precisely lock the clock output frequency and phase to an external reference signal. The PLL frequency synthesizer consists of five main components: a reference oscillator, an integer-N frequency synthesizer, a phase detector, a loop filter, and a voltage controlled oscillator (VCO).

The reference oscillator is an oscillation source that provides the reference signal for the PLL frequency synthesizer. This is usually a free-running oscillator, though it can also be a crystal oscillator. The frequency of the reference oscillator is used to generate the desired clock frequency output.

The integer-N frequency synthesizer uses the frequency of the reference oscillator to generate the desired frequency output. The frequency is generated by dividing down the reference frequency assuming a fixed input frequency, and this number is known as the divider value. The divider value can be adjusted by the user to achieve the desired frequency output.

The phase detector compares the phase of the reference signal with the output of the frequency synthesizer, and determines the amount of correction needed to keep the two phases in sync. This correction is then applied to the loop filter, which will adjust the divider value accordingly.

The voltage controlled oscillator (VCO) converts the adjusted divider value into a voltage signal, which is used to control the frequency of the VCO. This is the signal that is outputted as the clock signal.

The combination of the reference oscillator, integer-N frequency synthesizer, phase detector, loop filter, and voltage controlled oscillator works together to precisely generate the desired frequency output with minimal jitter and low phase noise performance. This allows for high accuracy and stability for modern applications.

The SI51218-A07980-GMR is designed to provide the highest levels of performance and accuracy, which makes it ideal for applications such as synchronous Ethernet, high-speed communication protocols, and high-end video applications.

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