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Analog Devices LTC6948IUFD-3#PBF — Clock & Timing ICs
Analog Devices

LTC6948IUFD-3#PBF Clock/Frequency Synthesizer, Fractional-N

MPNLTC6948IUFD-3#PBF
End of Life

Analog Devices LTC6948IUFD-3#PBF, a PLL-based Clock/Frequency Synthesizer (RF/IF), Fractional N, 1:1 input:output ratio, differential I/O, max frequency 5.79 GHz, 3.15V to 5.25V supply, -40°C to 105°C, 28-WFQFN exposed pad.

$19.09Ref. price · indicative, final on quote
LTC6948IUFD-3#PBF datasheet
Packaging28-WFQFN Exposed Pad
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

LTC6948IUFD-3#PBF Technical Specifications
ParameterValue
TypeClock/Frequency Synthesizer (RF/IF), Fractional N
Mounting typeSurface Mount
Voltage3.15V ~ 5.25V
Frequency5.79GHz
Operating temperature-40°C ~ 105°C
PLLYes
InputClock
OutputClock
PackageTube
Case28-WFQFN Exposed Pad
Divider (Multiplier)Yes/No
Number of circuits1
Ratio - Input:Output1:1
Differential - Input:OutputYes/Yes

Product details

Active production — what that means for your BOM

ROHS3 compliant per, which simplifies EU/UKCA compliance paperwork. The 28-QFN package is a common footprint — 4x5 mm, 0.5 mm pitch — so the board layout is straightforward and assembly houses are familiar with the reflow profile.

5.79 GHz fractional-N — where the frequency ceiling lands

This is a fractional-N PLL synthesizer that clocks out to 5.79 GHz maximum. That puts it in the sweet spot for 5G sub-6 GHz LO generation, point-to-point microwave IF chains, and test equipment that needs a clean, agile carrier up to C-band. Fractional-N architecture means you get fine step resolution without an external VCO — the loop filter and reference clock set the phase noise floor. The differential I/O helps reject common-mode noise when routing to a mixer or upconverter.

Industrial temp range and supply flexibility

The 3.15V to 5.25V supply lets you tap a 3.3V or 5V rail directly — no extra LDO needed if your board already carries one of those.

Sourcing through independent distribution

We source the LTC6948IUFD-3#PBF per RFQ against your BOM line. The Tube package is the standard production format; reel variants exist if your pick-and-place prefers tape.

Frequently asked questions

When sourcing LTC6948IUFD-3#PBF, what's the closest functional second-source — LTC6948IUFD-4#PBF?

The LTC6948IUFD-4#PBF is a pin-compatible sibling with a higher max frequency of 6.39 GHz. The -3 variant tops out at 5.79 GHz. If your LO needs stay below 5.79 GHz, the -3 is the correct choice; the -4 adds headroom at a slightly higher cost. Both share the same 28-QFN package, supply range, and temp grade.

What reference clock does LTC6948IUFD-3#PBF require?

The input is a single-ended or differential clock. The datasheet (not reproduced here) specifies the reference frequency range and phase-noise requirements for the loop filter design. Typical choices are a TCXO or OCXO between 10 MHz and 100 MHz, depending on the desired output step size and phase noise target.