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Features
  • Low Noise Integer-N PLL
  • 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 Spurious Performance
  • Output Divider (1 to 6, 50% Duty Cycle)
  • Low Noise Reference Buffer
  • Output Buffer Muting
  • Charge Pump Supply from 3.15V to 5.25V
  • Charge Pump Current from 250μA to 11.2mA
  • Configurable Status Output
  • SPI Compatible Serial Port Control
  • PLLWizard™ Software Design Tool Support
Additional Details
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The LTC6945 is a high performance, low noise, 6GHz phase-locked loop (PLL), including a reference divider, phase-frequency detector (PFD) with phase-lock indicator, charge pump, integer feedback divider and VCO output divider.

The part features a buffered, programmable VCO output divider with a range of 1 through 6. The differential, low noise output buffer has user-programmable output power ranging from –6dBm to 3dBm, and may be muted through either a digital input pin or software.

The low noise reference buffer outputs a typical 0dBm square wave directly into a 50Ω impedance from 10MHz to 250MHz, or may be disabled through 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.

Applications

  • Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
  • Broadband Wireless Access
  • Microwave Data Links
  • Military and Secure Radio
  • Test and Measurement
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Documentation View All Documentation
Linduino LTC6945 - Linduino Header File Download 22.00KB Linduino LTC6945 - DC1649A.INO Download 37.00KB IBIS Model LTC6945 - IBIS Model Download 93.00KB Linduino LTC6945 - Linduino.CPP File Download 30.00KB
Part Models 1
1ku List Price
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LTC6945

Documentation

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Data Sheet

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UPDATED 03/17/2015
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LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer Data Sheet

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UPDATED 06/22/2015
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LTC6945: ノイズとスプリアスを極めて低く抑えた0.35GHz～6GHz 整数分周方式シンセサイザ データシート

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User Guide

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UPDATED 01/24/2012
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DC1649A - Demo Manual redirect icon

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Application Note

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UPDATED 12/17/2013
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AN143 - A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current redirect icon

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Reliability Data

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UPDATED 03/23/2018
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R565 Reliability Data redirect icon

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Technical Articles

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UPDATED 01/03/2014
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AN143 - A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current redirect icon

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UPDATED 02/10/2015
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Phase Noise of Integer-N and Fractional-N PLL Synthesizers redirect icon

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UPDATED 02/10/2015
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PLLシンセサイザの位相ノイズ、インテジャーN型とフラクショナルN型にはどのような差が出るのか？ redirect icon

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Documentation

Technical Documents 6
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Data Sheet 1

LTC6945: Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer Data Sheet

Reliability Data 1

R565 Reliability Data

User Guide 1

DC1649A - Demo Manual

Application Note 1

AN143 - A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current

Technical Articles 2

AN143 - A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current
Phase Noise of Integer-N and Fractional-N PLL Synthesizers

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Ultralow Noise Synthesizers

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2017-09-18

Low Phase Noise Frequency Synthesizers for RF Applications

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC6945IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

Software & Part Ecosystem

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LTC6950
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1.4GHz Low Phase Noise, Low Jitter PLL with Clock Distribution

High Voltage Op Amps ≥12V1
LT1678
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PRODUCTION

Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps

I/Q Demodulators1
LTC5585
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PRODUCTION

Wideband IQ Demodulator with IIP2 and DC Offset Control

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ADF41510
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RECOMMENDED FOR NEW DESIGNS

10 GHz, Integer-N/Fractional-N PLL Synthesizer

 
PLLWizard
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PLLWizard is used to communicate with the LTC6945 and LTC6946 synthesizers. It uses the DC590 controller to translate between USB and SPI-compatible serial communications formats. It also includes advanced PLL design and simulation capabilities which aid in loop filter design and selecting the correct SPI map register values.

  • file-icon HTML Readme - Complete Installation Instructions external icon
  • file-icon HTML Download - For Windows 7, Windows Vista, and Windows XP or Windows Server 2003 with at least .NET 2.0 external icon
  • file-icon HTML Download - For Windows XP 2003 without .NET 2.0 or Windows Server 2003 without .NET 2.0 external icon

    • Evaluation Kits 2

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    DC2429A

    LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency

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    DC2429A

    LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency

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    DC2429A
    LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency
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    Product Detail

    Demonstration Circuit 2429A is a PLL/VCO Supply and Reference Frequency Board that features the LT3042, an ultralow noise and ultrahigh PSRR RF linear regulator. When powered from a 6V to 20V lab or wall wart supply, the DC2429A produces four ultralow noise supplies using seven LT3042s. These supplies include a fixed 3.3V/800mA supply (four LT3042's in parallel), a fixed 5V/200mA supply, a fixed 3.3V/200mA supply that powers an onboard 100MHz ultralow jitter crystal oscillator, and an adjustable voltage (2.5V to 15V), 200mA supply ideal for powering external VCOs. The DC2429 ensures PLL/VCO evaluation meets data sheet performance.


     


    Resources

    pdf icon

    PDF

    DC2429A - Schematic Download

    61.00K

    pdf icon

    PDF

    DC2429A - Demo Manual Download

    382.00K

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    DC2429A - Design Files Download

    1.00M

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    DC1649A-A

    LTC6945 Demo | Ultralow Noise and Spurious 6GHz Integer-N Synthesizer, VCO=902-928Hz, (Requires DC590)

    Evaluation Kits2

    evaluation kit item images

    DC2429A

    LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency
    evaluation kit item images

    DC1649A-A

    LTC6945 Demo | Ultralow Noise and Spurious 6GHz Integer-N Synthesizer, VCO=902-928Hz, (Requires DC590)

    Tools & Simulations 3

    Linduino

    Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

    Linduino code repository on GitHub and instructions on how to use the code.

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    Code Files

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    LTC6945 - Linduino.CPP File redirect

    LTC6945 - Linduino Header File redirect

    LTC6945 - DC1649A.INO redirect

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