SI5347B-A-GM

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The SI5347B-A-GM is a high-performance, clock generator with an integrated 25MHz crystal oscillator and a fractional-N PLL. This device requires a single supply voltage of either 3.3V or 5V and is capable of generating four buffered outputs with frequencies in the range of 8 kHz to 170 MHz, making it ideal for a variety of applications. Its features include low power consumption, a wide supply voltage range and small size, making it a suitable choice for consumer, industrial and communications products.

The SI5347B-A-GM is based on a highly integrated silicon clock generator and it includes a variety of features that maximize flexibility. The device includes three programmable outputs (33-170 MHz), a crystal oscillator, a fractional-N PLL and two programmable channel outputs (8 kHz-50 MHz). The on-chip differential clock generator can be programmed to operate at any frequency up to 170 MHz in 12.5 kHz steps, while the fractional-N PLL allows for any fractional frequency output. It also has an on-chip voltage controlled crystal oscillator (VCXO) to generate low-phase-noise clocks.

The high-performance clock generator offers a variety of features and benefits. It has an integrated crystal oscillator, allowing for frequency stability and accuracy. It also features low jitter and fast frequency switching, allowing for increased system performance. Additionally, it has programmable output frequencies, enabling a high degree of flexibility, as well as onboard power management, making it ideal for environments that require reduced power consumption. Overall, this device allows for greater accuracy and performance in clock-driven systems.

The SI5347B-A-GM works by using a fractional-N PLL to generate four output clocks. The fractional PLL consists of a loop filter, a digital divide-by-N counter, and a frequency-divider-by-K counter. These components are utilized to achieve ultra-low jitter performance and frequency switching times of less than 28 milliseconds.

The fractional-N PLL can be programmed to achieve a variety of fractional frequency combos and to achieve a desired output frequency. The loop filter is optimized for the specific application to achieve the desired performance, such as accuracy and low jitter. The divide-by-N counter is used to divide the input reference frequency to the PLL and it sets the number of output clocks that the device can generate. The frequency-divider-by-K counter allows the output clock frequency to be divided to any desired frequency within the limits of the device’s capabilities. Finally, the on-chip VCXO is used to fine-tune the output frequency and to achieve the desired performance.

The SI5347B-A-GM is an ideal choice for applications requiring precise clock generation, frequency flexibility and low power consumption. It is suitable for a variety of consumer, industrial and communications products and offers low jitter and fast frequency switching, making it a popular choice for high-performance applications. Its integrated VCXO and PLL make it an ideal solution for applications requiring low-phase-noise clocks and precise clock timing.

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