LTC6948

LAST TIME BUY

LTC6948

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

LAST TIME BUY

Part Details

LTC6948-4 Phase Noise, fRF = 6236MHz slide

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Part Models 7

1ku List Price Starting From $9.00

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

Additional Details

The LTC6948 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.

Applications

Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
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 7

1ku List Price Starting From $9.00

Documentation

Technical Documents 4

LTC6948: Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO Data Sheet 04/13/2017

R565 Reliability Data 03/23/2018

DC1959A - Demo Manual 06/18/2014

DC1959B - Demo Manual 12/07/2015

Reference Materials 3

Uncompromising Fractional-N Synthesizers 09/22/2014

Ultralow Noise Fractional-N Synthesizer 08/13/2014

Latest Developments in Analog Devices PLL Portfolio 02/01/2018

Design Resources 7

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
LTC6948IUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-3#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-4#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC6948IUFD-4#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC6948IUFD-1#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

LTC6948IUFD-1#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

LTC6948IUFD-2#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

LTC6948IUFD-2#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

LTC6948IUFD-3#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

LTC6948IUFD-4#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

LTC6948IUFD-4#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

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Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC6948IUFD-1#PBF

LTC6948IUFD-1#TRPBF

LTC6948IUFD-2#PBF

LTC6948IUFD-2#TRPBF

LTC6948IUFD-3#TRPBF

LTC6948IUFD-4#PBF

LAST TIME BUY

LTC6948IUFD-4#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

LTC6948IUFD-1#PBF

LTC6948IUFD-1#TRPBF

LTC6948IUFD-2#PBF

LTC6948IUFD-2#TRPBF

LTC6948IUFD-3#TRPBF

LTC6948IUFD-4#PBF

LAST TIME BUY

LTC6948IUFD-4#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

LTC6948IUFD-1#PBF

LTC6948IUFD-1#TRPBF

LTC6948IUFD-2#PBF

LTC6948IUFD-2#TRPBF

LTC6948IUFD-3#TRPBF

LTC6948IUFD-4#PBF

LAST TIME BUY

LTC6948IUFD-4#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

LTC6948IUFD-1#PBF

LTC6948IUFD-1#TRPBF

LTC6948IUFD-2#PBF

LTC6948IUFD-2#TRPBF

LTC6948IUFD-3#TRPBF

LTC6948IUFD-4#PBF

LAST TIME BUY

LTC6948IUFD-4#TRPBF

pdf

PDN23_0089_Form

xls

Material_Report

Software & Part Ecosystem

Companion Parts 4

Parts	Product Life Cycle	Description
High Speed Comparators (<100ns Propagation Delay)1
LTC6957		Low Phase Noise, Dual Output Buffer/Driver/Logic Converter
I/Q Modulators1
LTC5588-1	PRODUCTION	200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3
Integer-N PLL1
ADF4002	RECOMMENDED FOR NEW DESIGNS	Phase Detector / PLL Frequency Synthesizer
Single, Double, and Triple Balanced Mixers1
LTC5569	PRODUCTION	300MHz to 4GHz 3.3V Dual Active Downconverting Mixer

Alternative Parts 2

Parts	Product Life Cycle	Description
ADF4368	RECOMMENDED FOR NEW DESIGNS	Microwave Wideband Synthesizer with Integrated VCO
ADF4355	RECOMMENDED FOR NEW DESIGNS	Microwave Wideband Synthesizer with Integrated VCO

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

DC1959B-D

LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

Download

DC1959B-D

LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

Buy Now View Details

Product Detail

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.

Resources

ZIP

DC1959B - Design Files

1.00M

PDF

DC1959B - Schematic

54.00K

PDF

DC1959B - Demo Manual

907.00K

DC1959B-A

LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

Download

DC1959B-A

LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

Buy Now View Details

Product Detail

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.

Resources

ZIP

DC1959B - Design Files

1.00M

PDF

DC1959B - Schematic

54.00K

PDF

DC1959B - Demo Manual

907.00K

DC1959B-B

LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)

DC1959B-B

LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)

Buy Now View Details

Product Detail

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.

There are four options of the DC1959B, one for each version of the LTC6948. Table 1 summarizes the available DC1959B options.

The DC1959B provides 50Ω SMA connectors for the reference frequency input f_REF (REF+IN) and the differential RF output (RF+ and RF–).

A DC590 USB serial controller board is used for SPI communication with the LTC6948, controlled by the supplied FracNWizard^™ software.

Resources

ZIP

DC1959B - Design Files

1.00M

PDF

DC1959B - Schematic

54.00K

PDF

DC1959B - Demo Manual

907.00K

DC1959A-C

LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)

LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)

Download

DC1959A-C

LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)

Buy Now View Details

Product Detail

Demonstration circuit 1959A features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO. There are four options of the DC1959A, one for each version of the LTC6948. Table 1 summarizes the available DC1959A options.

Resources

PDF

DC1959A - Demo Manual

811.00K

PDF

DC1959A - Schematic

57.00K

ZIP

DC1959A - Design Files

1.00M

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

DC1959B-D

LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

DC1959B-A

LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

DC1959B-B

LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)

DC1959A-C

LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (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

LTC6948 - Linduino.CPP File

LTC6948 - Linduino Header File

LTC6948 - DC1959A 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

LTC6948 - IBIS Model

93.00KB

Latest Discussions

33 Weeks Ago

RE: LTC6948 ALCLO flag

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Part Details

Documentation

Software & Part Ecosystem

Evaluation Kit

Tools & Simulations

Latest Discussions

LTC6948

Features

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Product Selector Card 1

Solutions Bulletin & Brochure 1

Webcast 1

Feb 20, 2022

Mar 20, 2024

Software & Part Ecosystem