LTC6948IUFD-3#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6948IUFD-3#TRPBF is a fractional-N phase-locked loop (PLL) synthesizer with an integrated voltage-controlled oscillator (VCO). It operates in the 3.84GHz to 5.79GHz VCO frequency range, providing an output frequency range of 0.640GHz to 5.790GHz via a programmable divider (1–6). The device features a 4th-order delta-sigma modulator for low spurious performance and supports reference inputs up to 425MHz. It utilizes a 28-lead QFN package and requires 3.3V digital supplies and 5V analog supplies.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO with 3.84GHz to 5.79GHz tuning range
• Advanced 4th-order delta-sigma modulator eliminates discrete spurs
• Programmable output divider (O_DIV) from 1 to 6
• Supports reference frequencies up to 425MHz

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wireless basestations (LTE, WiMAX, W-CDMA)
• Microwave data links
• Military and secure radio systems
• Test and measurement equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the #TRPBF suffix indicates tape and reel packaging rather than tube packaging. Confirm the -I suffix denotes the industrial temperature range of –40°C to 105°C. Ensure the specific -3 variant matches the required 3.84GHz to 5.79GHz VCO frequency band for the design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when the target output frequency falls within the 3.84GHz to 5.790GHz range (at O_DIV=1). Compare against LTC6948-1, -2, and -4 if different VCO bands are needed. Use FracNWizard software to optimize loop bandwidth and charge pump settings for specific jitter requirements.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6948 family of ultralow noise fractional-N synthesizers. The -3 designation specifically defines the internal VCO operating range between 3.84GHz and 5.79GHz. Other variants include the -1 (2.24–3.74GHz), -2 (3.08–4.91GHz), and -4 (4.20–6.39GHz).

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LTC6948IUFD-3#PBF is the tube-packaged equivalent of the same electrical device. For different frequency ranges, consider LTC6948IUFD-1#TRPBF, LTC6948IUFD-2#TRPBF, or LTC6948IUFD-4#TRPBF.