LTC6946IUFD-4#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-4#TRPBF is an ultralow noise and spurious integer-N synthesizer with an integrated VCO, covering a frequency range of 4.20GHz to 6.39GHz. 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. It delivers –226dBc/Hz normalized in-band phase noise floor and supports SPI-compatible serial port control.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO with no external components required; internally calibrated
• Output divider range of 1 through 6 providing wide frequency coverage
• Charge pump current adjustable from 250µA to 11.2mA with selectable voltage clamps
• Configurable status output and buffered low-noise reference buffer

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 direct manufacturer channels. Confirm the specific -4 suffix indicates the 4.20GHz to 6.39GHz VCO frequency range variant. Ensure proper handling for the QFN-28 package during assembly to maintain thermal and electrical performance standards.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when the target application requires output frequencies between 4.20GHz and 6.39GHz at output divider setting 1. Consider the -1, -2, or -3 variants if lower frequency bands are needed. Verify that the system can support the required 5V supply for the VCO and charge pump circuits alongside the standard 3.3V logic supplies.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N synthesizers. The IUFD-4 designation specifies the industrial temperature range (-40°C to 105°C), the QFN-28 plastic package, and the specific high-frequency VCO calibration band. The #TRPBF suffix indicates tape and reel packaging with lead-free finish.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices marketing for alternative solutions or updated product recommendations.