LTC6948IUFD-2#TRPBF

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6948IUFD-2#TRPBF is a fractional-N phase-locked loop synthesizer with an integrated voltage-controlled oscillator (VCO). It operates within a VCO frequency range of 3.08 GHz to 4.91 GHz and supports reference input frequencies up to 425 MHz. The device features a 4th-order delta-sigma modulator for low spurious performance, an output divider ranging from 1 to 6, and an SPI interface for configuration. It utilizes separate supply rails: 3.15 V to 3.45 V for digital/reference circuits and 4.75 V to 5.25 V for the VCO and charge pump.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCO with frequency range of 3.08 GHz to 4.91 GHz
• Advanced 4th-order delta-sigma modulator for ultralow spurious levels
• Programmable output divider with integer settings from 1 to 6
• Reference input frequency support up to 425 MHz

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wireless basestations (LTE, WiMAX, W-CDMA, PCS)
• 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 when sourcing. Confirm the -I suffix corresponds to the industrial temperature range of –40°C to 105°C. Ensure the specific -2 variant matches the required 3.08 GHz to 4.91 GHz VCO frequency band for the design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part for applications requiring the 3.08 GHz to 4.91 GHz internal VCO range. Use the output divider to extend the usable output frequency down to approximately 513 MHz. Compare against LTC6948-1, -3, and -4 variants if different frequency bands are needed.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6948 family of ultralow noise fractional-N synthesizers. The -2 designation specifically defines the internal VCO operating range between 3.08 GHz and 4.91 GHz. Other family members cover adjacent or higher frequency bands.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LTC6948IUFD-1#TRPBF, LTC6948IUFD-3#TRPBF, and LTC6948IUFD-4#TRPBF are pin-compatible alternatives within the same package offering different VCO frequency ranges.