LTC6948 - Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO

The LTC®6948 is a high performance, low noise, 6.39GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD), ultralow noise charge pump, fractional feedback divider, and VCO output divider.

The fractional divider uses an advanced, 4th order ΔΣ modulator which provides exceptionally low spurious levels. This allows wide loop bandwidths, producing extremely low integrated phase noise values.

The programmable VCO output divider, with a range of 1 through 6, extends the output frequency range.

Features
  • Low Noise Fractional-N PLL with Integrated VCO
  • No Δ-Σ Modulator Spurs
  • 18-Bit Fractional Denominator
  • –226 dBc/Hz Normalized In-Band Phase Noise Floor
  • –274 dBc/Hz Normalized In-Band 1/f Noise
  • –157 dBc/Hz Wideband Output Phase Noise Floor
  • Excellent Integer Boundary Spurious Performance
  • Output Divider (1 to 6, 50% Duty Cycle)
  • Output Buffer Muting
  • Reference Input Frequency Up to 425MHz
  • Fast Frequency Switching
  • FracNWizard™ Software Design Tool Support
Typical Application
LTC6948 Typical Application
LTC6948 Typical Application
Applications
  • Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
  • Microwave Data Links
  • Military and Secure Radio
  • Test and Measurement
Packaging
LTC6948 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC6948IUFD-1#PBF4x5 QFN-28I$10.36$7.25
LTC6948IUFD-1#TRPBF4x5 QFN-28I$7.31
LTC6948IUFD-2#PBF4x5 QFN-28I$10.36$7.25
LTC6948IUFD-2#TRPBF4x5 QFN-28I$7.31
LTC6948IUFD-3#PBF4x5 QFN-28I$10.36$7.25
LTC6948IUFD-3#TRPBF4x5 QFN-28I$7.31
LTC6948IUFD-4#PBF4x5 QFN-28I$10.36$7.25
LTC6948IUFD-4#TRPBF4x5 QFN-28I$7.31
Demo Boards
Part NumberDescriptionPrice
DC1959A-BLTC6948-2 Demo Board | Ultralow Noise and Spurious 513MHz to 4.91GHz Frac-N Synthesizer with Integrated VCO, (Req DC590)$125.00
DC1959A-CLTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Req DC590)$125.00
DC1959B-ALTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Req DC590 or DC2026)$125.00
DC1959B-DLTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Req DC590 or DC2026)$125.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC2429ALT3042 PLL/VCO Supply and Reference Board$150.00
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Datasheet
Reliability Data
Product Selector Card
LT Journal
Press Release
Software and Simulation
CAD Symbol
Ad
Linduino
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LTC6948 - DC1959A Linduino .INO File
LTC6948 - Linduino Header File
LTC6948 - Linduino.CPP File