SI5341B-D-GM

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The SI5341B-D-GM clock generator is a programmable, multi-output clock generator designed for use in systems that require low jitter. It is part of Silicon Labs’ Si53xx family of clock generators, each offering multiple outputs for various applications. The SI5341B-D-GM in particular offers five outputs, making it well-suited for applications that require multiple frequencies.

The SI5341B-D-GM and other Si53xx devices are particularly useful in communication protocols and memory interface applications that require lower clock jitter in order to improve system timing and integrity. The SI5341B-D- GM remains jittered to within 10ps total integrated jitter (TIJ) under all conditions, and the device is capable of generating frequencies as low as 1MHz.

Features

The SI5341B-D-GM is a configurable and flexible device with a wide range of features. It offers a reference input range of 10 – 100 MHz with a programmable output frequency range of 8kHz to 800MHz. It offers timing flexibility with a wide range of output configurations, including LVPECL, LVDS, CML, HCSL, and SSTL. It also offers phase shifted versions for both LVDS and LVPECL, allowing the user to adjust the phase of the output clock signals.

The device also offers programmable output frequency slicing, allowing the user to program two frequency bits to determine the fractional relationship between the reference input frequency and the output frequency. With frequency slicing, the user can achieve jitter performance at higher frequencies.

The SI5341B-D-GM also features an integrated PLL and VCO, providing the user with a plug-and-play solution for achieving low jitter. The device also offers onboard EEPROM that stores the programmed configuration, allowing for easier re-programming of the device.

Applications

The SI5341B-D-GM is well-suited for communication chip and system-level applications that require low jitter. It is commonly used in high-speed memory interfaces, such as DDR3, DDR4, and HMC. It is also used in applications that require multiple frequencies with low phase noise, such as 10G SFP+ applications. In addition, it is also used in high-speed network backbones that require low jitter.

Working Principle

The SI5341B-D-GM works by using an internal phase-locked loop (PLL). The PLL consists of a phase detector, charge pump, and loop filter, which work together to lock the output frequency to a reference clock frequency. The phase detector compares the input reference clock and the device’s output clock, and the charge pump creates a current proportional to the phase difference between the clocks. The loop filter acts to filter this current, and the resulting voltage then drives the VCO, which is responsible for generating the output clock frequency.

The output frequency can be set by programming the internal registers of the device. The registers can be programmed with an I2C interface or via the device’s self-configuring algorithm. The device also features on-board EEPROM that stores the programmed configuration, allowing the device to be re-programmed without needing to reprogram the registers.

Conclusion

The SI5341B-D-GM is a programmable, multi-output clock generator designed for use in communication applications where low jitter is needed. Its wide range of features makes it suitable for a variety of applications, such as high-speed memory interfaces, 10G SFP+ applications, and high-speed network backbones. It works by using a phase-locked loop (PLL) to lock the output frequency to a reference clock frequency, and it can be programmed by an I2C interface or by the device’s self-configuring algorithm. With its wide range of features and high jitter performance, the SI5341B-D-GM is an ideal solution for any application that requires low jitter.

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