LTC6948IUFD-3

Description：IC CLK/FREQ SYNTH 28QFN
Series：-

SKU:ba56205f8c26 Category: Clock Generators, PLLs, Frequency Synthesizers Brand: Analog Devices Inc.

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Product introduction

LTC6948IUFD-3 is listed in the Clock Generators, PLLs, Frequency Synthesizers range at ChipApex. The manufacturer field lists Analog Devices Inc.. Its product description is IC CLK/FREQ SYNTH 28QFN. Review the specifications below when checking this part for your BOM.

Clock Generators, PLLs, Frequency Synthesizers specifications for LTC6948IUFD-3

Description：IC CLK/FREQ SYNTH 28QFN
Series：-
Package：Tube
Mfr：Analog Devices Inc.
PLL：Yes
Input：Clock
Output：Clock
Number of Circuits：1
Ratio - Input:Output：1:01
Differential - Input:Output：Yes/Yes
Frequency - Max：5.79GHz
Divider/Multiplier：Yes/No
Voltage - Supply：3.15V ~ 5.25V
Operating Temperature：-40°C ~ 105°C (TJ)
Mounting Type：Surface Mount
Package / Case：28-WFQFN Exposed Pad
Supplier Device Package：28-QFN (4x5)
Type：Clock/Frequency Synthesizer (RF/IF), Fractional N
Grade：-
Qualification：-

Clock Generators, PLLs, Frequency Synthesizers datasheet and documents for LTC6948IUFD-3

LTC6948IUFD-3

Clock Generators, PLLs, Frequency Synthesizers Overview

The LTC6948IUFD-3 is a fractional-N phase-locked loop synthesizer with an integrated voltage-controlled oscillator (VCO). It features a 4th-order delta-sigma modulator for low spurious performance and supports reference frequencies up to 425MHz. The device operates on 3.3V digital supplies and 5V analog supplies, drawing approximately 48mA at 5V. It provides an output frequency range of 3.84GHz to 5.79GHz with an output divider setting of 1. The component is housed in a 28-lead QFN package and includes an SPI interface for configuration.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

Integrated VCO with output frequency range of 3.84GHz to 5.79GHz (O_DIV = 1)
Advanced 4th-order delta-sigma modulator eliminates fractional spurs
Normalized in-band phase noise floor of -225 dBc/Hz
Programmable charge pump current from 1mA to 11.2mA

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 specific suffix #PBF indicates lead-free RoHS compliance. Confirm the -3 variant matches the required 3.84GHz to 5.79GHz frequency band. Ensure the UFD package footprint aligns with PCB layout requirements. Check for availability of the DC1959A-C demonstration board for evaluation purposes.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when the target output frequency falls between 3.84GHz and 5.79GHz. Consider the -1, -2, or -4 variants if different base VCO ranges are needed. Verify that the system can provide separate 3.3V and 5V power rails. Use the FracNWizard software tool to optimize loop filter components and phase noise performance.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the LTC6948 family of ultralow noise fractional-N synthesizers. Other variants include the LTC6948IUFD-1, -2, and -4, which offer different VCO frequency ranges. All members share the same pinout and functional architecture but differ in their internal VCO tuning characteristics and output bands.