1. Products
  2. RF and Microwave
  3. Phase Locked Loop (PLL) Synthesizer & Translation Loop
  4. Integer-N PLL
  5. LTC6945


Alternative Parts

Overview

Features and Benefits

  • 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

Product Details

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

Product Lifecycle icon-not-recommended Last Time Buy

All products in this family will be obsolete soon. Please contact ADI Sales or Distributors to arrange for final purchases and read our Obsolescence Information to review the time periods for placing final orders and receiving final shipments.

Evaluation Kits (2)

Software & Systems Requirements

Evaluation Software

PLLWizard

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.

Tools & Simulations

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.

Purchase Linduino

Linduino

IBIS Model

Design Tool

ADIsimPLL™

ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.

Product Recommendations

LTC6945 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC6945IUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Wafer Fabrication Data R565 Reliability Data

PCN-PDN Information

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Sample & Buy


Ordering FAQs


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Buy Now Pricing


(**) Displayed Buy Now Price and Price Range is based on small quantity orders.

 

List Pricing


(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

 

Lead Times


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Sampling


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Price Table Help

 

Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.