SI5338B-B07535-GMR

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SI5338B-B07535-GMR application field and working principle

The SI5338B-B07535-GMR, part of the ClockBuilder Pro family of devices, is a high performance Programmable Clock Generator. It offers a 2.8125Gbps to 3.125Gbps frequency range, ultra-low jitter, low power consumption, and a programmable spread-spectrum capability that meets the clocking requirements of a wide variety of applications, including telecom and data communications, graphics and multimedia imaging, digital HDTV, and embedded systems.

The SI5338B-B07535-GMR is a particularly ideal product for applications that require multiple reference clocks with adjustable frequencies. It offers 8 differential outputs that can be independently divided by fractional-N or integer-N techniques, and it can generate up to 32 clocks with frequency accuracy up to 20 ppm. Additionally, it can provide high frequency accuracy in the range of 250 fs to 4 ns and two external reference clocks.

The SI5338B-B07535-GMR comes with a PLL-based feedback system, which allows for a fast lock time. The device also provides spread-spectrum capability, which helps to reduce the amount of EMI emissions generated by the system, allowing it to meet the most stringent EMI requirements. It also offers an adjustable slew rate, which can help to improve overall system performance.

The SI5338B-B07535-GMR also offers integrated test features, such as programmable frequency sweep mode, which helps optimize the performance of the part. In addition, the part is fully user programmable and offers an SPI/I2C Interface and LVCMOS-compatible control pins. It also comes with a VDD Rise Time Monitor that helps protect the part against overvoltage damage.

The SI5338B-B07535-GMR is targeted for applications that require jitter performance and flexibility, including telecom and data communications, networking, and embedded systems. In particular, it is suited for applications such as PCIe 3.0, SGMII, Fiber Channel, DP++, and USB3.0.

How does it Work?

The SI5338B-B07535-GMR uses an integrated Phase-Locked Loop (PLL) to generate the output clocks. The PLL consists of three key components: a voltage controlled oscillator (VCO), a phase/frequency detector (PFD), and a loop filter.

The VCO is a type of oscillator which is able to generate a frequency that can be varied according to an applied control voltage. It is the heart of the PLL, used to generate the desired output frequency.

The PFD is used to compare the incoming frequency (the reference clock) with the output frequency of the VCO, and generate a feedback signal used to adjust the voltage applied to the VCO to either increase or decrease the output frequency in order to maintain the desired output frequency.

The loop filter is an important function of the PLL, used to filter out frequency and phase noise from the feedback signal. It is a low pass filter, which acts as an integrator, only allowing low frequency signals to pass and rejecting the high frequency noise.

The SI5338B-B07535-GMR also offers adjustments such as VCO substitution, loop filter compensation, and spread-spectrum modulation. These adjustments help to optimize the clocking performance of the device for a particular application.

Conclusion

The SI5338B-B07535-GMR is a powerful, high performance device designed to meet the requirements of a variety of applications including telecom and data communications, graphics and multimedia imaging, digital HDTV, and embedded systems. Utilizing a PLL-based architecture and a range of user adjustable features, it provides an ideal solution for applications that require multiple reference clocks with adjustable frequencies.

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