SI4126-F-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI4126-F-GMR is a monolithic ISM RF synthesizer with integrated VCOs for wireless communications, manufactured by Skyworks Solutions Inc. It performs dual-band RF synthesis (RF1: 2300–2500 MHz; RF2: 2025–2300 MHz) and IF synthesis (62.5–1000 MHz). The device operates on a 2.7 V to 3.6 V supply, drawing 25.7 mA typically. It features low phase noise (-130 dBc/Hz at 1 MHz offset for RF1), a 5 µA standby current, and a three-wire serial interface for programmable divider and powerdown settings.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual-band RF synthesis covering 2025 MHz to 2500 MHz ranges
• Integrated VCOs, loop filters, and reference dividers
• Low phase noise performance of -130 dBc/Hz at 1 MHz offset
• Three-wire serial interface for register programming

Clock Generators, PLLs, Frequency Synthesizers Applications

• ISM and MMDS band communications
• Wireless LAN and WAN systems
• Dual-band communication devices

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer designation as Skyworks Solutions Inc. against the datasheet source which identifies Silicon Laboratories as the original designer. Confirm the package type corresponds to the 'GM' suffix (28-lead QFN) rather than other available options like TSSOP. Ensure the specific frequency bands required match the Si4126 variant specifications.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for applications requiring dual-band RF synthesis in the 2.0 GHz to 2.5 GHz range. The device integrates necessary passive components, reducing external BOM. Consider the 2.7 V to 3.6 V operating voltage and the need for an external crystal or oscillator connected to the XIN pin for reference frequency input.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si4136/Si4126 family of ISM RF synthesizers. The Si4126 variant specifically supports dual-band RF operation, whereas other family members may differ in VCO configurations or frequency ranges. The 'F' suffix typically denotes a specific temperature grade or revision within the product line.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other parts from the Si4136/Si4126 family, such as the Si4136, provided the frequency requirements align. Verify pin compatibility and software register definitions when substituting between variants.