LTC6946IUFD-2

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6946IUFD-2 is an ultralow noise and spurious integer-N synthesizer with an integrated VCO, covering a frequency range of 3.08GHz to 4.91GHz. It features a fully integrated phase-locked loop (PLL) including a reference divider, phase-frequency detector, charge pump, and output divider. The device offers –226dBc/Hz normalized in-band phase noise floor and –274dBc/Hz normalized in-band 1/f noise. It operates on supply voltages of 3.15V to 3.45V for digital/RF sections and 4.75V to 5.25V for the VCO and charge pump. The part 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
• Charge pump current adjustable from 250µA to 11.2mA
• SPI-compatible serial port control

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
• Broadband Wireless Access
• Military and Secure Radio
• Test and Measurement

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required tape and reel or tube packaging format. Ensure the lead-free finish designation corresponds to current manufacturing standards.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the LTC6946IUFD-2 variant specifically when the target RF output frequency falls within the 3.08GHz to 4.91GHz range. Consider the output divider setting to determine if the internal VCO range aligns with the desired system frequency. Verify that the application supports the required 5V supply for the VCO and charge pump circuits.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6946 family of integer-N synthesizers. Other variants include the LTC6946-1 (2.24–3.74GHz), LTC6946-3 (3.84–5.79GHz), and LTC6946-4 (4.20–6.39GHz). All variants share identical pinouts and functional blocks but differ in their calibrated VCO frequency coverage.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct substitutes within the same family are the LTC6946IUFD-1#PBF, LTC6946IUFD-3#PBF, and LTC6946IUFD-4#PBF. These parts offer different VCO frequency ranges but maintain electrical compatibility and pinout consistency.