SI51218-A05906-GM

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SI51218-A05906-GM is an integrated generator/multiplier/capacity device specifically used as a programmable clock generator/frequency synthesizer in high performance Clock/Timing applications. This chip is based on a multi-phase electronic frequency-locked loop (EFLL) technique and belongs to the class of generalized multiphase clocks, which are widely used in digital designs due to the increased frequency range and precision. The SI51218-A05906-GM can perform frequency synthesis up to the frequencies of the front-end PLL and the output closer that is designed may even increase the frequency range. It has a wide supply voltage range and can generate clock signals with frequencies from 1 Hz to 400 MHz.

The core of the device comprises three main blocks. The first block is for PLL operation. This block contains a signal splitter, phase detector, charge pump, loop filter and digital phase frequency detector (DPFD). The signal splitter is a dual-input voltage-controlled oscillator that divides the phase and frequency signals of the incoming clock. The phase detector compares the phase and frequency of the clock signals and produces an error signal that is filtered and amplified by the charge pump and loop filter block. This signal is then used by the DPFD to control the external voltage-controlled oscillator that generates the synthesized clock signal.

The second block is used for frequency multiplication. This block contains a high performance frequency doubler combined with a diversity mirror that provides a 2× frequency boost. The magnification factor can be externally adjusted using a control pin. Finally, the last block is for frequency tuning. This consists of a dual-digital temperature-compensated oscillator and a temperature-compensated crystal oscillator that are used to adjust the internal accuracy of the generated output frequency. The two block functions together provide high precision frequency tuning and temperature compensation.

In addition to its frequency synthesis capabilities, the SI51218-A05906-GM also contains a variety of other features. It includes a digital logic supply voltage regulator, which is capable of providing a low voltage, stable logic supply voltage to the device. The device also includes a wide range of input / output buffer options to facilitate external read or write operations. The device also includes a number of external control pins to enable the user to control the settings of the device.

The SI51218-A05906-GM is a suitable choice for programmable clock generator and frequency synthesizer applications because it offers good frequency accuracy, high precision frequency tuning, and temperature compensation. The device is also designed to be compatible with a wide range of input / output buffer and logic supply voltage options, making it an ideal choice for a variety of Clock/Timing applications.

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