LTC6946IUFD-1#PBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-1#PBF is an ultralow noise and spurious integer-N synthesizer with a fully integrated VCO, covering a frequency range of 2.240 GHz to 3.740 GHz. It features a programmable output divider (1 to 6), a low-noise reference buffer, and a charge pump with adjustable current from 250 µA to 11.2 mA. The device operates on 3.3V digital supplies and 5V analog supplies, drawing approximately 49 mA. It includes SPI-compatible serial port control, configurable status outputs, and internal calibration without external system support.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO with no external components required for operation
• Ultralow normalized in-band phase noise floor of –226 dBc/Hz
• Programmable output divider ranging from 1 to 6 with 50% duty cycle
• SPI-compatible serial port control with configurable status output

Clock Generators, PLLs, Frequency Synthesizers Applications

• Low noise integer-N PLL systems
• Military and secure radio communications
• Test and measurement equipment
• Broadband wireless access infrastructure

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix #PBF indicates tube packaging rather than tape and reel. Confirm the -I suffix denotes the industrial temperature range of –40°C to 105°C. Ensure the -1 variant matches the required 2.240 GHz to 3.740 GHz frequency coverage. Check for end-of-life notifications as availability may be limited.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when the target RF output falls within the 2.240 GHz to 3.740 GHz range at O_DIV=1. Consider higher variants (-2, -3, -4) if frequencies above 3.740 GHz are needed. Verify that the 3.3V logic levels are compatible with the host controller's SPI interface requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N synthesizers. The -1 suffix specifically designates the lowest frequency band option among the four available variants. All variants share the same QFN-28 package and core architecture but differ in their internal VCO tuning ranges.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation. Consult Analog Devices marketing for cross-reference information or newer generation replacements.