SI5345A-B04804-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5345A-B04804-GM is a low-jitter, 10-output clock synthesizer and jitter attenuator. It utilizes fourth-generation DSPLL and MultiSynth technologies to generate any combination of output frequencies from any input frequency. The device supports differential inputs from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 1028 MHz for differential outputs and up to 250 MHz for LVCMOS. It features ultra-low jitter performance of 90 fs rms and meets ITU-T G.8262 EEC Option 1 and 2 standards. The component operates on a single 1.8 V core voltage and includes in-circuit programmable non-volatile memory.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using fractional and integer synthesis modes.
• Provides ultra-low jitter attenuation with a programmable loop bandwidth ranging from 0.1 Hz to 4 kHz.
• Supports hitless input clock switching between fractionally related clocks and glitchless frequency changes.
• Includes in-circuit programmable non-volatile memory for persistent configuration storage.

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) compliant systems
• Carrier Ethernet switches
• SONET/SDH line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory preprogrammed configuration associated with the B04804 suffix against the required system specifications. Confirm that the QFN-64 package dimensions match the PCB land pattern requirements. Ensure compatibility with the I2C or SPI serial interface used by the host controller for initialization and monitoring.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when high-frequency outputs up to 1028 MHz are required alongside low-jitter performance. The Si5345A variant supports both integer and fractional synthesis modes, offering greater flexibility than integer-only versions. Verify that the application requires ten independent output channels and four input options for redundancy or synchronization.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 family, which also includes the Si5344 (4 outputs) and Si5342 (2 outputs). All variants share similar internal architectures and feature sets but differ in pin count and output capacity. The Si5345A specifically denotes the high-performance version capable of generating frequencies up to 1028 MHz with full fractional synthesis capabilities.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5345A-D-GMR

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the Si5345A?

The Si5345A supports differential output frequencies up to 1028 MHz and LVCMOS output frequencies up to 250 MHz.

Does the device support locking to gapped input clocks?

Yes, the DSPLL can lock to gapped input clocks provided the minimum frequency is 10 MHz with no more than two missing cycles out of every eight.

How is the loop bandwidth configured?

The loop bandwidth is digitally programmable via the serial interface, allowing settings between 0.1 Hz and 4 kHz for optimization of jitter performance.