LTC6955

Ultralow Jitter, 7.5GHz, 11 Output Fanout Buffer Family

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Recommended for New Designs

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Overview

Features and Benefits
Product Details

Features and Benefits

LTC6955: 11 Output Buffer
LTC6955-1: 10 Buffered Outputs and One ÷2 Output
Additive Output Jitter ~45fs RMS (ADC SNR Method)
Additive Output Jitter < 5fs RMS
- (Integration BW = 12kHz to 20MHz, f = 7.5GHz)

Eleven Ultralow Noise CML Outputs
Parallel Control for Multiple Output Configurations
–40°C to 125°C Operating Junction TemperatureRange

Product Details

The LTC6955 is a high performance, ultralow jitter, fanout clock buffer with eleven outputs. Its 4-pin parallel control port allows for multiple output setups, enabling any number between three and eleven outputs, as well as a complete shutdown. The parallel port also provides the ability to invert the output polarity of alternating outputs, simplifying designs with top and bottom board routing. Each of the CML outputs can run from DC to 7.5GHz. The LTC6955-1 replaces one output buffer with a divideby-2 frequency divider, allowing it to drive Analog Devices’ LTC6952 or LTC6953 to generate JESD204B subclass 1 SYSREF signals. These SYSREFs can pair with ultralow jitter device clocks from the LTC6955-1, which can run at frequencies up to 7.5GHz.

Applications

High Performance Data Converter Clocking
SONET, Fibre Channel, GigE Clock Distribution
Low Skew and Jitter Clock and Data Fanout
Wireless and Wired Communications
Single-Ended to Differential Conversion

Product Categories

Clock and Timing
- Clock Distribution Devices

High Speed Logic and Data Path Management
- Fanout Buffers

Markets and Technologies

Aerospace and Defense (2)
- Missiles and Precision Munitions
- Aerospace and Defense Radar Systems

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (3)

DC2664A

VCO Rider Board with Loop Filter

DC2611A-A

LTC6955/LTC6955-1: Ultralow Jitter 11 Output Fanout Buffer

DC2611A-B

LTC6955/LTC6955-1: Ultralow Jitter 11 Output Fanout Buffer

DC2664A

View Detailed Evaluation Kit Information

Demonstration circuit 2664A is a VCO Rider Board with Loop Filter that supports the popular 0.5" × 0.5" VCO package footprint.

The DC2664A expedites evaluation of Phase-Locked Loop (PLL) devices requiring an external Voltage Controlled Oscillator (VCO). Without the DC2664A, each VCO and PLL combination requires a unique loop filter design, resulting in several PLL demo board modifications to evaluate each VCO. These board modifications are time consuming and often result in damage to either the PLL or the VCO.

The DC2664A integrates the VCO and loop filter allowing these unique designs to reside on multiple DC2664As. The DC2664A RFOUT and VTUNE SMA connections allow the user to quickly evaluate a PLL with multiple VCOs without risk of damage from multiple board modifications.

VCOs are notoriously sensitive to power supply noise and spurs. The DC2664A resolves the concern of locating a low noise and low spurious lab supply by powering the VCO with an onboard ultralow noise and ultrahigh PSRR LDO, the LT3042. A second LT3042 LDO is available on the DC2664A to power an active loop filter. Both LDOs are powered from a single supply, simplifying the number of lab supplies required to evaluate a VCO and PLL combination.

The DC2664A was designed to mate directly with the LTC6955 (DC2611A) and LTC6952 (DC2609A) demo boards.

Resources

DC2611A-A

View Detailed Evaluation Kit Information

Demonstration Circuit 2611A features the LTC6955, Ultralow Jitter 11 Output Fanout Buffers.

By default, the DC2611A is powered from a single 3.3V supply. An option is provided to power to the DC2611A from dual supplies, allowing for the LTC6955’s output supply pins to connect to an LTC Silent Switcher® and the LTC6955 input supply pin to connect to a low noise LDO.

The differential inputs and six of the differential outputs are populated with 0.5" spaced SMA connectors. These outputs are AC-coupled with 50Ω transmission lines making them suitable to drive 50Ω impedance instruments. All registered trademarks and trademarks are the property of their respective owners.

The remaining four differential outputs are terminated with 100Ω.

A calibration path is provided to aid in accurate LTC6955 propagation delay measurements. The calibration path can be also reconfigured as a DC path, which allows for a convenient method of locking the LTC6955 outputs to an external PLL/VCO.

Resources

DC2611A-B

View Detailed Evaluation Kit Information

Demonstration Circuit 2611A features the LTC6955-1, Ultralow Jitter 11 Output Fanout Buffers.

By default, the DC2611A is powered from a single 3.3V supply. An option is provided to power to the DC2611A from dual supplies, allowing for the LTC6955-1’s output supply pins to connect to an LTC Silent Switcher® and the LTC6955-1 input supply pin to connect to a low noise LDO.

The remaining four differential outputs are terminated with 100Ω.

A calibration path is provided to aid in accurate LTC6955-1 propagation delay measurements. The calibration path can be also reconfigured as a DC path, which allows for a convenient method of locking the LTC6955-1 outputs to an external PLL/VCO.

Resources

Documentation & Resources

Data Sheets

LTC6955: Ultralow Jitter, 7.5GHz, 11 Output Fanout Buffer Family Data Sheet (Rev. 0)
5/29/2018

PDF

1 M

User Guides

DC2611A Demo Manual
2/20/2019

PDF

2 M
DC2609A Demo Manual
2/11/2019

PDF

872 K
DC2664A Demo Manual
1/22/2019

PDF

944 K

Product Selection Guide

RF, Microwave, and Millimeter Wave Product Selection Guide
7/13/2018

PDF

9M

Press Releases

Ultralow Jitter Clock Generation (4.5GHz) & Clock Distribution (7.5GHz) Family
4/21/2022

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
LTC6955IUKG#PBF	Material Declaration	Reliability Data	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC6955IUKG#TRPBF	Material Declaration	Reliability Data	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC6955IUKG-1#PBF	Material Declaration	Reliability Data	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC6955IUKG-1#TRPBF	Material Declaration	Reliability Data	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
Wafer Fabrication Data

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Support & Discussions

LTC6955 Discussions

RE: SERDES differential to single ended

RE: 36GHz RF oscillation signal source

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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.