LTC6951
Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO
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Features
- Low Noise Integer-N PLL with Integrated VCO
- Output Jitter:
- 90fs RMS (12kHz to 20MHz)
- 115fs RMS (ADC SNR Method)
- Noise Floor = –165dBc/Hz at 250MHz
- EZSync™, ParallelSync™ Multichip Synchronization
- SYSREF Generation for JESD204B/JESD204C, Subclass 1
- Output Frequency Range:
- 1.95MHz to 2.5GHz (LTC6951)
- 2.1MHz to 2.7GHz (LTC6951-1)
- –229dBc/Hz Normalized In-Band Phase Noise Floor
- –277dBc/Hz Normalized In-Band 1/f Noise
- Five Independent, Low Noise Outputs
- Reference Input Frequency up to 425MHz
- LTC6951Wizard™ Software Design Tool Support
- –40°C to 105°C Operating Junction Temperature Range
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The LTC6951 is a high performance, low noise, Phase Locked Loop (PLL) with a fully integrated VCO. The low noise VCO uses no external components and is internally calibrated to the correct output frequency with no external system support.
The clock generation section provides five outputs based on the VCO prescaler signal with individual dividers for each output. Four outputs feature very low noise, low skew CML logic. The fifth output is low noise LVDS. All outputs can be synchronized and set to precise phase alignment using the programmable delays.
Choose the LTC6951-1 if any desired output frequency falls in the ranges 2.5GHz to 2.7GHz, 1.66GHz to 1.8GHz, or 1.25GHz to 1.35GHz. Choose the LTC6951 for all other frequencies.
Applications
- High Performance Data Converter Clocking
- Wireless Infrastructure
- Test and Measurement
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Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
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LTC6951
Documentation
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Product Selector Card 1
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 |
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| LTC6951IUHF#PBF |
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
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| LTC6951IUHF#TRPBF |
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
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| LTC6951IUHF-1#PBF |
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
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| LTC6951IUHF-1#TRPBF |
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
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- LTC6951IUHF#PBF
- Pin/Package Drawing
-
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
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SamacSys
- LTC6951IUHF#TRPBF
- Pin/Package Drawing
-
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC6951IUHF-1#PBF
- Pin/Package Drawing
-
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- LTC6951IUHF-1#TRPBF
- Pin/Package Drawing
-
40-Lead QFN (5mm x 7mm x 0.75mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
Filter by Model
Part Models
Product Lifecycle
PCN
Mar 20, 2024
- 23_0089
Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process
LTC6951IUHF#PBF
LTC6951IUHF#TRPBF
LTC6951IUHF-1#PBF
LTC6951IUHF-1#TRPBF
Filter by Model
Part Models
Product Lifecycle
PCN
Mar 20, 2024
- 23_0089
Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process
LTC6951IUHF#PBF
LTC6951IUHF#TRPBF
LTC6951IUHF-1#PBF
LTC6951IUHF-1#TRPBF
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
|---|---|---|---|---|
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High Speed Comparators (<100ns Propagation Delay)1 |
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Low Phase Noise, Dual Output Buffer/Driver/Logic Converter |
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Integer-N PLL1 |
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RECOMMENDED FOR NEW DESIGNS |
Phase Detector / PLL Frequency Synthesizer |
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Standard High Speed A/D Converters2 |
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PRODUCTION |
16-Bit, 210Msps High Performance ADC |
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PRODUCTION |
Dual 14-Bit 250Msps ADC with JESD204B Serial Outputs |
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Evaluation Kits 4
DC2430A
DC2430A Linduino SPI 1:8 Expander Demonstration Board (DC2026 Included)
Product Detail
Demonstration circuit 2430A is a Linduino® SPI 1:8 Expander Shield. The DC2430A shield routes SPI and I2C signals from one DC2026 to one of eight selectable QuikEval™ connector sites. When a DC2430A QuikEval connector site is selected, an LED will illuminate next to the active site.
Resources
DC2248A-A
LTC6951 Demo Board | 5-Output Integer-N PLL with Integrated VCO, Output Range: 1.95MHz to 2.5GHz (requires DC590 or DC2026)
Product Detail
Demonstration circuit 2248A features the LTC6951, an Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO.
For ease of use, the DC2248A is powered from a single 6V supply and comes installed with a 100MHz reference. Direct access to the LTC6951 5V, 3.3V and the reference supplies is possible by removing jumpers. For evaluation of the LTC6951 with other references, the DC2248A can be modified to accommodate different onboard or external components.
Resources
DC2248A-B
LTC6951-1 Demo Board | 5-Output Integer-N PLL with Integrated VCO, Output Range: 2.1MHz to 2.7GHz (requires DC590 or DC2026)
Product Detail
Demonstration circuit 2248A features the LTC6951, an Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO.
For ease of use, the DC2248A is powered from a single 6V supply and comes installed with a 100MHz reference. Direct access to the LTC6951 5V, 3.3V and the reference supplies is possible by removing jumpers. For evaluation of the LTC6951 with other references, the DC2248A can be modified to accommodate different onboard or external components.
Resources
DC2226A-A
4-Channel 14-Bit 250Msps JESD204B ADC with Clocking [Featuring LTC2123, LTC6951]
Product Detail
Demonstration Circuit 2226A-A is a reference design for a four-channel, 250Msps ADC system consisting of two LTC2123, dual 14-bit 250Msps ADCs and a JESD204B Subclass 1 clocking solution based on the LTC6951 Clock Synthesizer with Integrated VCO. Other dash options reserved for future use. No external clock source is required to operate the board; however, the on-board 100MHz reference oscillator may be bypassed, allowing synchronization to other equipment.
Companion Board: Kintex Board
Resources
Evaluation Kits4
Tools & Simulations 3
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.
Code Files
Linduino
LTC6951Wizard
IBIS Model 1
