SI5345D-B04125-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345D-B04125-GM is a clock synthesizer and jitter cleaner from the Si5345 family, manufactured by Skyworks Solutions Inc. It features four inputs and ten outputs housed in a 64-QFN package measuring 9x9 mm. The device supports integer and fractional frequency synthesis with an output frequency range of 0.001 MHz to 350 MHz. It operates on core voltages of VDD at 1.8 V ±5% and VDDA at 3.3 V ±5%, with independent output supplies configurable for 3.3 V, 2.5 V, or 1.8 V. The operating temperature range spans from -40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fourth-generation DSPLL and MultiSynth technologies.
• Provides ultra-low jitter performance of 90 fs rms with digitally programmable jitter attenuation bandwidth ranging from 0.1 Hz to 4 kHz.
• Supports hitless input clock switching, free-run, synchronous, and holdover modes with automatic or manual selection capabilities.

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN muxponders and transponders
• 10/40/100 G networking line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet (ITU-T G.8262)
• Carrier Ethernet switches
• SONET/SDH line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the numerical suffix B04125, as this determines the exact frequency plan stored in the non-volatile memory. Confirm that the ordering part number matches the required Rev D datasheet specifications and package type. Ensure compatibility with the ClockBuilder Pro software for any necessary post-purchase adjustments or verification of the NVM data.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the SI5345D variant specifically when the application requires an output frequency range limited to 350 MHz. This model offers both integer and fractional synthesis modes suitable for generating precise clock signals. Consider the 64-QFN package dimensions and the requirement for external crystal components between 25 MHz and 54 MHz for optimal jitter performance in free-run and holdover modes.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345/44/42 Rev D family of jitter attenuators and clock multipliers. The Si5345 sub-series is distinguished by its ten-output capability within a 64-pin QFN footprint, contrasting with the four-output Si5344 and two-output Si5342 variants. All models share the same underlying DSPLL architecture and support identical input configurations and serial interface protocols.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include SI5345A-D-GM, SI5345B-D-GM, and SI5345C-D-GM. These alternatives differ primarily in their maximum supported output frequency ranges and synthesis mode restrictions. Verify that the replacement part's frequency range covers the design requirements before substitution.