LTC6947

Obsolete

LTC6947

Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer

Obsolete

Alternative Part

ADF41510

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

ADF41510

RECOMMENDED FOR NEW DESIGNS

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

Obsolete

Part Details

11GHz Source for Satellite Communications slide

System Phase Noise, fRF = 11.260GHz slide

11GHz Source for Satellite Communications

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Part Models 2

1ku List Price Starting From $7.39

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

Additional Details

The LTC6947 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.

Applications

Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
Broadband Wireless Access
Microwave Data Links
Military and Secure Radio
Test and Measurement

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $7.39

Documentation

Technical Documents 3

LTC6947: Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer Data Sheet 08/13/2014

R565 Reliability Data 03/23/2018

DC1846A - Demo Manual 08/28/2014

Reference Materials 2

Uncompromising Fractional-N Synthesizers 09/22/2014

Ultralow Noise Fractional-N Synthesizer 08/13/2014

Design Resources 2

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
LTC6947IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6947IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC6947IUFD#PBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC6947IUFD#TRPBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC6947IUFD#PBF

LAST TIME BUY

LTC6947IUFD#TRPBF

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Mar 20, 2024

- 23_0089

Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process

LTC6947IUFD#PBF

LAST TIME BUY

LTC6947IUFD#TRPBF

pdf

PDN23_0089_Form

xls

Material_Report

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC6947IUFD#PBF

LAST TIME BUY

LTC6947IUFD#TRPBF

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Mar 20, 2024

- 23_0089

Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process

LTC6947IUFD#PBF

LAST TIME BUY

LTC6947IUFD#TRPBF

pdf

PDN23_0089_Form

xls

Material_Report

Software & Part Ecosystem

Companion Parts 3

Parts	Product Life Cycle	Description
High Speed Comparators (<100ns Propagation Delay)1
LTC6957		Low Phase Noise, Dual Output Buffer/Driver/Logic Converter
High Voltage Op Amps ≥12V1
LT1678	PRODUCTION	Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps
I/Q Modulators1
LTC5588-1	PRODUCTION	200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3

Alternative Parts 1

Parts	Product Life Cycle	Description
ADF41510	RECOMMENDED FOR NEW DESIGNS	10 GHz, Integer-N/Fractional-N PLL Synthesizer

Evaluation Software 1

FracNWizard is used to communicate with the LTC6947 and LTC6948 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.

HTML Readme - Complete Installation Instructions

HTML Download and Install - QuikEval

HTML Download - For Windows 7, Windows Vista, and Windows XP or Windows Server 2003 with at least .NET 3.5 SP1

Evaluation Kit

DC1846A-A

LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)

LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)

Download

DC1846A-A

LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)

Buy Now View Details

Product Detail

Demonstration circuit 1846A features the LTC6947, an Ultralow Noise and Spurious Fractional-N Synthesizer. DC1846A provides 50Ω SMA connectors for the reference frequency (REF+) and the two single-ended RF outputs (RF+ and RF–).

Resources

ZIP

DC1846A - Design Files

2.00M

PDF

DC1846A - Demo Manual

941.00K

PDF

DC1846A - Schematic

65.00K

DC2429A

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

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

Download

DC2429A

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

Buy Now View Details

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

DC2429A - Schematic

61.00K

PDF

DC2429A - Demo Manual

382.00K

ZIP

DC2429A - Design Files

1.00M

DC1846A-A

LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)

DC2429A

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

Tools & Simulations

Linduino 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.

Purchase Linduino

Linduino download and documentation

Code Files

Linduino

LTC6947 - Linduino.CPP File

LTC6947 - Linduino Header File

LTC6947 - DC1846A Linduino .INO File

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.

Open Tool

IBIS Model 1

Simulation Model

IBIS Model

LTC6947 - IBIS Model

93.00KB

Latest Discussions

1 Years Ago

RE: LTC6947 / HMC732 and Active Loop Filter (AD797)

1 Years Ago

RE: DC590B & DC2692A Msg : Cannot load COM module for the device

View related discussion on EngineerZone

Part Details

Documentation

Software & Part Ecosystem

Evaluation Kit

Tools & Simulations

Latest Discussions

LTC6947

RECOMMENDED FOR NEW DESIGNS

Features

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Product Selector Card 1

Solutions Bulletin & Brochure 1

Feb 20, 2022

Mar 20, 2024

Software & Part Ecosystem