LTC6946IUFD-3#PBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-3#PBF is an ultralow noise and spurious integer-N synthesizer with a fully integrated VCO, covering a frequency range of 3.84 GHz to 5.79 GHz at O_DIV=1. It features a programmable output divider (1–6), adjustable charge pump current (250 µA to 11.2 mA), and SPI-compatible control. The device operates on 3.3V digital supplies and 5V analog supplies, with a junction temperature range of –40°C to 105°C. Key electrical parameters include a normalized in-band phase noise floor of –226 dBc/Hz and a wideband output phase noise floor of –157 dBc/Hz.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated low-noise VCO with no external components and internal calibration
• Programmable output divider ranging from 1 to 6 for flexible frequency coverage
• Adjustable charge pump current from 250 µA to 11.2 mA with selectable voltage clamps
• SPI serial port control with configurable status output and buffer muting

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wireless base stations (LTE, WiMAX, W-CDMA, PCS)
• Broadband wireless access systems
• Military and secure radio communications
• Test and measurement equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging. Confirm the -3 variant matches the required 3.84 GHz to 5.79 GHz frequency band. Check for end-of-life status or discontinuation notices from Analog Devices prior to finalizing procurement plans.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when the target RF output frequency falls within the 3.84 GHz to 5.79 GHz range at divide-by-1. Consider other variants (-1, -2, -4) if different frequency bands are needed. Ensure supply voltages meet the 3.3V digital and 5V analog requirements for optimal performance.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N PLLs with integrated VCOs. The -3 suffix specifically designates the frequency coverage option of 3.84 GHz to 5.79 GHz. Other family members cover lower or higher frequency ranges, sharing identical pinouts and control interfaces.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements within the same package and functionality include LTC6946IUFD-1#PBF, LTC6946IUFD-2#PBF, and LTC6946IUFD-4#PBF, provided their respective frequency ranges suit the application. Verify that the substitute part's frequency coverage aligns with system requirements.