SI5335D-B03214-GM

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Clock generators, PLLs, and frequency synthesizers are devices used in numerous digital signal processing and signal transmission applications. The SI5335D-B03214-GM from Silicon Labs is a clock generator device that offers wide-ranging low-jitter frequency synthesis, phase-aligned outputs, and spread spectrum for EMI reduction. It is well-suited to many applications such as communications, multimedia, computing, HPC, and memory, to name a few. This article looks at the application field and working principle of the SI5335D-B03214-GM.

Overview of the SI5335D-B03214-GM

The SI5335D-B03214-GM is a clock generator, PLL and frequency synthesizer device that supports up to three outputs. It has an integrated voltage-controlled crystal oscillator (VCXO) and clock fan-out buffer, which allows it to be connected to a wide range of input frequencies. The SI5335D-B03214-GM also supports an advanced spread-spectrum mode, which can reduce EMI significantly. Its outputs range from 24MHz to 155MHz, with jitter values of 150femtoseconds (fs) typically.

Applications of the SI5335D-B03214-GM

The SI5335D-B03214-GM has application in the communications, multimedia, computing, HPC and memory markets. It can be used in clock generating applications such as Telecom line cards, DSL access controllers, Ethernet switches, and network processor systems. In the multimedia sector, it can be used for Set-Top boxes and video encoder/decoders. For computing applications, it is ideal for CPU/graphics subsystems, peripheral card applications, HPC clusters and server systems. Finally, the SI5335D-B03214-GM can be used in memory applications such as GDDR3, GDDR4 and DDR3/4.

Working Principle of the SI5335D-B03214-GM

The SI5335D-B03214-GM takes an external reference clock, and generates up to three low-jitter clock outputs. The device\'s integrated VCXO allows a wide range of frequencies, and flexibility in generating various frequencies. Its integrated clock fan-out buffer allows it to be connected to a wide range of input frequencies, which are processed and synthesized by the PLL and output as clock signals. The device also includes an advanced spread-spectrum mode, which can reduce EMI significantly. The SI5335D-B03214-GM uses an external, temperature-compensated voltage-controlled crystal unit, to provide a low-jitter reference for its internal PLL, and its spread spectrum clock output.

For clock generation, the SI5335D-B03214-GM uses a modified form of digitally-controlled phase-locked loop (PLL). This is essentially a loop filter, oscillator and phase detector that are connected in a feedback loop. The loop filter is designed to control the oscillator frequency and the phase detector is used to compare the phases of the input and output signals. If there is a difference in the phases, the phase detector will cause the oscillator frequency to be shifted, until the phases of the input and output signals are aligned.

The SI5335D-B03214-GM also supports spread spectrum clock modulation. This is achieved by applying an additional current signal to the VCXO, resulting in operation at lower frequencies than would normally be used. This is particularly useful for applications where low electromagnetic interference (EMI) is required. The device also incorporates a voltage-controlled clock divider which allows the user to scale the clock frequencies on the two outputs. This helps to reduce the jitter amplitude on the output signals.

The SI5335D-B03214-GM is a versatile clock generator, PLL and frequency synthesizer device, offering a wide range of features and capabilities. It is ideal for applications such as communications, multimedia, computing, HPC, and memory. Its integrated VCXO, spread spectrum clock output and voltage-controlled clock divider make it ideal for applications where low-jitter and low-EMI operation are required. It is well-suited to a wide range of applications, and its connected oscillator, PLL, and spread spectrum clock output feature makes it a great choice for customers in numerous industries.

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