SI5345A-B04228-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345A-B04228-GMR is a factory preprogrammed clock synthesizer and jitter cleaner from the Si5345 family. It features four inputs and ten outputs, supporting any-frequency generation up to 1028 MHz with integer and fractional synthesis modes. The device utilizes fourth-generation DSPLL technology for ultra-low jitter performance of 90 fs rms. It operates on a 1.8 V core voltage and a 3.3 V analog supply, housed in a 64-QFN package. The part supports differential and LVCMOS input levels, with output levels configurable as LVDS, LVPECL, LVCMOS, CML, or HCSL.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using integer and fractional synthesis.
• Features an integrated loop filter and digitally programmable jitter attenuation bandwidth for optimized noise performance.
• Supports hitless input clock switching between fractionally related clocks and glitchless on-the-fly frequency changes.
• Includes in-circuit programmable non-volatile memory to ensure known frequency configuration upon power-up.

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 suffix B04228 against the target design requirements. Confirm that the GMR tape-and-reel packaging format aligns with automated assembly capabilities. Ensure compatibility with the required serial interface protocols and check for any lead time constraints due to limited availability status.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this variant when a fixed, preconfigured frequency plan is preferred over field programming. The Si5345A designation indicates support for output frequencies up to 1028 MHz with both integer and fractional synthesis. Verify that the 10-output count and 4-input capacity meet the system architecture needs compared to lower-channel options like the Si5344 or Si5342.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Skyworks Si5345/44/42 Rev D family of jitter attenuators. The Si5345A specifically denotes the high-performance tier capable of generating frequencies up to 1028 MHz. The 'B' prefix in the ordering code identifies a unique factory-programmed configuration, while 'GMR' specifies the reel packaging option.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements within the same family include other Si5345A variants with different preprogrammed configurations, such as SI5345A-Dxxxxx-GMR. For applications requiring fewer outputs, the Si5344A or Si5342A series may serve as pin-compatible alternatives if channel count permits reduction.