LTC6946IUFD-2#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-2#TRPBF is an ultralow noise and spurious integer-N synthesizer with an integrated VCO, manufactured by Analog Devices Inc. It operates within a VCO frequency range of 3.08 GHz to 4.91 GHz. The device features a fully integrated phase-locked loop (PLL) including a reference divider, phase-frequency detector, charge pump, and output divider. 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. It utilizes a 28-lead QFN package and supports SPI-compatible serial port control for configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated low-noise VCO with no external components required
• Normalized in-band phase noise floor of –226 dBc/Hz
• Output divider range from 1 to 6 with 50% duty cycle
• Charge pump current adjustable from 250µA to 11.2mA

Clock Generators, PLLs, Frequency Synthesizers Applications

• Low Noise Integer-N PLL with Integrated VCO
• Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
• Military and Secure Radio
• Test and Measurement

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm the manufacturer is Analog Devices Inc. and ensure the part number matches the exact model requirements for the 3.08 GHz to 4.91 GHz frequency range. Check for RoHS compliance documentation as specified in official datasheets.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6946IUFD-2 variant specifically for applications requiring a VCO frequency range between 3.08 GHz and 4.91 GHz. Ensure the design accommodates the required supply voltages: 3.15V to 3.45V for digital/reference supplies and 4.75V to 5.25V for VCO/charge pump supplies. Consider the thermal resistance characteristics of the QFN-28 package for heat dissipation.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N synthesizers. Other variants in the series include the LTC6946-1 (2.24–3.74 GHz), LTC6946-3 (3.84–5.79 GHz), and LTC6946-4 (4.20–6.39 GHz). All variants share the same architecture but differ in their internal VCO calibration and frequency coverage options.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements within the same family include the LTC6946IUFD-1#TRPBF, LTC6946IUFD-3#TRPBF, and LTC6946IUFD-4#TRPBF, provided the frequency range differences are acceptable. Verify pin compatibility and supply voltage requirements before substitution.