SI5335D-B04023-GMR

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The SI5335D-B04023-GMR is a clock generator module from SiTime, and is utilized in a wide range of industrial and telecommunications applications, including frequency dividers, transmitters, receivers, and networking devices. It is part of what is known as the "Clock/Timing" category, which includes clock generators, phase locked loops (PLLs), and frequency synthesizers.

The key application field for this module is in high-performance systems, especially in industrial applications and telecoms, where precise timing and multiple frequency signals are expected. It is a reliable solution for these requirements, offering a very low long-term jitter of 0.445 ps RMS in a 30 kHz to 500 MHz frequency range.

The SI5335D-B04023-GMR module uses a variety of technologies and architectures to provide main outputs in multiple frequencies, including sine wave and other waveforms. It can be used to generate and convert a variety of signals, such as pulse-width modulation (PWM), square wave, duty cycle, and frequency measurements.

The module architecture uses differential clocks with a single reference clock input that is used to derive several frequencies and phase shifts of the differential clocks. These frequencies and phase shifts are used to generate signals for various digital interfaces and data transfer protocols such as Serial RapidIO, PCI Express, and Gigabit Ethernet.

By combining a crystal oscillator and a wide frequency range voltage-controlled oscillator (VCO), the SI5335D-B04023-GMR module is highly flexible and configurable. It is also designed to meet stringent regulatory requirements, with wide range options such as an output band-pass filter, on-chip clock synchronization and EMI filter to reduce EMI detection levels.

This module can be used to regulate and synchronize various system clocks and signals, which includes clocks in radars, robots, test equipment and wireless routers. It is also suitable for applications like Ethernet-to-Ethernet synchronization, clock synchronization of optical transceivers, Fieldbus communication and production automation control.

The SI5335D-B04023-GMR demonstrates its working principle through the use of phase-locked loops (PLLs). PLLs are formed from several individual clocks and consist of a phase detector, a low pass filter, a VCO, and a frequency divider. Due to its ability to lock onto a reference frequency, it forms an integral component of clock synchronization.

The module consists of an input dual-mode quartz crystal oscillator (QXO) which ensures precision timing of the reference frequency. This reference frequency is then used to drive the phase detector, which forms the basis of the PLL. The output of the phase detector is fed into a fourth-order low pass filter, which shapes and modulates the components of the reference frequency to control the VCO in the module.

The VCO output is then fed back to the phase detector and compared to the reference to ensure that the two signals stay in phase. The VCO output is regulated by the low-pass filter, which prevents the PLL from shifting from its original condition. The output from the VCO is then fed into a frequency divider, which induces different frequencies from the reference. At the end, various frequencies and phase shifts are generated from the reference, which can then be used in the various applications.

The SI5335D-B04023-GMR module from SiTime is part of the Clock/Timing category, and is designed for high-performance systems in industrial and telecommunications applications. It utilizes a crystal oscillator and a VCO, combined with PLLs, to provide a low jitter, reliable solution for generating and converting a variety of frequency signals.

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