LTC6946IUFD-1#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-1#TRPBF is an ultralow noise and spurious integer-N synthesizer with an integrated VCO, covering a frequency range of 2.240 GHz to 3.740 GHz. It features a fully integrated phase-locked loop (PLL) including a reference divider, phase-frequency detector, charge pump, and output divider. The device operates with supply voltages of 3.15V to 3.45V for digital/RF sections and 4.75V to 5.25V for the VCO and charge pump. Key electrical characteristics 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 SPI-compatible serial port control and is housed in a 28-lead QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated low-noise VCO with no external components required
• Programmable output divider ranging from 1 to 6
• Adjustable charge pump current from 250µA to 11.2mA
• Configurable status output and buffer muting capabilities

Clock Generators, PLLs, Frequency Synthesizers Applications

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

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm the specific ordering suffix #TRPBF indicates tape and reel packaging. Ensure the part number matches the -1 variant for the 2.240 GHz to 3.740 GHz frequency range. Check for RoHS compliance documentation as specified in the datasheet.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6946IUFD-1 variant specifically for applications requiring the 2.240 GHz to 3.740 GHz VCO frequency range. Consider the output divider setting when determining the final RF output frequency. Ensure the design supports the required 5V supply for VCP+ and VVCO+ pins. Verify that the PCB layout accommodates the thermal requirements of the exposed ground pad.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N synthesizers. Other variants include the -2, -3, and -4 models, which offer different VCO frequency ranges up to 6.39 GHz. All variants share the same pinout and functional architecture but are calibrated for distinct frequency bands. The IUFD designation indicates an industrial temperature range of –40°C to 105°C.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements within the same family include LTC6946IUFD-2#TRPBF, LTC6946IUFD-3#TRPBF, and LTC6946IUFD-4#TRPBF, provided the application frequency aligns with their respective ranges. Cross-family replacement requires verification of pin compatibility and electrical parameter alignment.