LTC6946IUFD-3#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-3#TRPBF is an ultralow noise integer-N synthesizer with a fully integrated VCO, covering a frequency range of 3.84 GHz to 5.79 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 multiple supplies: 3.15V to 3.45V for digital/RF sections and 4.75V to 5.25V for the VCO and charge pump. It includes SPI-compatible 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; internally calibrated
• Output frequency range of 3.84 GHz to 5.79 GHz (LTC6946-3 variant)
• Programmable output divider with integer settings from 1 to 6
• Charge pump current adjustable from 250 µA to 11.2 mA in 12 steps
• Normalized in-band phase noise floor of –226 dBc/Hz

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 component authenticity through authorized Analog Devices distributors or certified suppliers. Confirm the ordering suffix #TRPBF indicates tape and reel packaging. Check for RoHS compliance documentation and ensure the part matches the specified –40°C to 105°C industrial temperature grade.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6946-3 variant specifically for applications requiring the 3.84 GHz to 5.79 GHz frequency band. Ensure supply voltages are within the specified ranges: 3.15V–3.45V for VD+, VREF+, VRF+, and VREFO+, and 4.75V–5.25V for VCP+ and VVCO+. Consider the output divider setting when determining final RF output frequencies.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of high-performance PLLs with integrated VCOs. Other variants include the LTC6946-1 (2.24–3.74 GHz), LTC6946-2 (3.08–4.91 GHz), and LTC6946-4 (4.20–6.39 GHz). All share the same QFN-28 package and functional architecture but differ in VCO frequency coverage.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. For pin-compatible alternatives, consult Analog Devices marketing or technical support for cross-reference information.