LTC6947 - Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer

The LTC®6947 is a high performance, low noise, 6GHz phase-locked loop (PLL), 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. The differential, low-noise output buffer has user-programmable output power ranging from –4.3dBm to +4.5dBm, and may be muted through either a digital input pin or software.

The ultralow noise charge pump contains selectable high and low voltage clamps useful for VCO monitoring, and also may be set to provide a V+/2 bias.

All device settings are controlled through a SPI-compatible serial port.

Features
  • Low Noise Fractional-N PLL
  • No ΔΣ Modulator Spurs
  • 18-Bit Fractional Denominator
  • 350MHz to 6GHz VCO Input Range
  • –226dBc/Hz Normalized In-Band Phase Noise Floor
  • –274dBc/Hz Normalized In-Band 1/f Noise
  • –157dBc/Hz Wideband Output Phase Noise Floor
  • Excellent Integer Boundary Spurious Performance
  • Output Divider (1 to 6, 50% Duty Cycle)
  • Output Buffer Muting
  • Charge Pump Supply from 3.15V to 5.25V
  • Charge Pump Current from 1mA to 11.2mA
  • Reference Input Frequency Up to 425MHz
  • Fast Frequency Switching
  • FracNWizard™ Software Design Tool Support
Typical Application
LTC6947 Typical Application
LTC6947 Typical Application
Applications
  • Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
  • Broadband Wireless Access
  • Microwave Data Links
  • Military and Secure Radio
  • Test and Measurement
Packaging
LTC6947 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC6947IUFD#PBF4x5 QFN-28I$8.50$5.95
LTC6947IUFD#TRPBF4x5 QFN-28I$8.56$6.01
Demo Boards
Part NumberDescriptionPrice
DC1846A-ALTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Req DC590)$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
Software and Simulation
CAD Symbol
Ad
Linduino
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LTC6947 Footprints and Symbols
Ultralow Noise Fractional-N Synthesizer
LTC6947 - DC1846A Linduino .INO File
LTC6947 - Linduino Header File
LTC6947 - Linduino.CPP File