SI5338L-B07492-GMR

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The SI5338L-B07492-GMR from Silicon Labs is a clock generator IC offering one differential fixed output and multiple low jitter reference input selections. It is a low power device, which is widely used for application specific clocking solutions. This article explores the application field and working principle of this IC.

The available output frequency range of this IC is 50MHz to 562.5MHz, which makes it suitable for a wide range of applications including consumer, industrial and communication systems. Moreover, the integrated spread spectrum feature in this IC reduces the peak EMI by up to 20dBc and thus, it is suitable for applications where low EMI is important.

In terms of jitter performance, SI5338L-B07492-GMR supports wide input frequency range from 6MHz to 217MHz, which is ideal for frequency conversion or combining multiple reference frequencies in one clock generator. It also supports any-rate frequency synthesis, which allows for flexible frequency scaling enabled by low frequency ripple (LFR) features. The phase jitter of this IC is typically 35fs RMS and it also features a low phase noise of -157dBc/Hz at 2kHz offset.

Moreover, this IC offers excellent on-chip integration and comes in packages from 8mm to 100-pin TQFPs. It also offers dual PLLs in a small IC footprint and the IC is designed to work with the company\'s ClockBuilder Pro software. This makes it easier to configure and program the IC for a wide range of application specific requirements.

The SI5338L-B07492-GMR is also designed to replace multiple discrete clock solutions and thus, provides cost effective as well as efficient clocking solutions. It offers higher reliability and improved jitter performance compared to traditional clock solutions.

The SI5338L-B07492-GMR works on the principle of phase locked loop (PLL). PLL is a feedback loop that enables the clock generator to derive a reference frequency from an external source and then convert it to various other frequencies. The reference frequency is an input frequency that acts as an anchor or source for the clock generator. Then, the PLL takes this reference frequency and uses a voltage controlled oscillator (VCO) to generate clock frequency that is needed. The output of the VCO is compared to the reference frequency and if there is a mismatch, a correction signal is issued and the VCO is adjusted accordingly. This process is repeated until the output of the VCO matches the reference frequency. It is this process that results in a clean and low-jitter clock frequency output.

Additionally, it supports spread spectrum clocking (SSC) feature which is used to reduce the peak level of EMI. With SSC, the amplitude and frequency of the peak EMI is spread over a wider bandwidth. Thus, the peak issue is addressed and the EMI profile is conformed to regulatory limits that are accepted by global governments.

The SI5338L-B07492-GMR is a great option for application specific clocking solutions. It offers a wide range of features that make it suitable for consumer, industrial and communication systems. It supports multiple reference input selections and offers low jitter performance and wide frequency range making it suitable for any-rate frequency synthesis and combining multiple reference frequencies in a single clock generator. Additionally, it also offers spread spectrum feature which reduces EMI levels thus making it an ideal choice for applications where EMI reduction is important. It provides an efficient, cost effective and higher reliability option compared to traditional discrete clock solutions.

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