Alternative Parts


Features and Benefits

  • Low Phase Noise and Jitter
  • Additive Jitter: 18fsRMS (12kHz to 20MHz)
  • Additive Jitter: 85fsRMS (10Hz to Nyquist)
  • EZSync Multichip Clock Edge Synchronization
  • Full PLL Core with Lock Indicator
  • –226dBc/Hz Normalized In-Band Phase Noise Floor
  • –274dBc/Hz Normalized 1/f Phase Noise
  • 1.4GHz Maximum VCO Input Frequency
  • Four Independent, Low Noise 1.4GHz LVPECL Outputs
  • One LVDS/CMOS Configurable Output
  • Five Independently Programmable Dividers Covering All Integers from 1 to 63
  • Five Independently Programmable VCO Clock Cycle Delays Covering All Integers from 0 to 63
  • –40°C to 105°C Junction Temperature Range

Product Details

The LTC6950 is a low phase noise integer-N frequency synthesizer core with clock distribution. The LTC6950 delivers the low phase noise clock signals demanded in high frequency, high resolution data acquisition systems.

The frequency synthesizer contains a full low noise PLL core with a programmable reference divider (R), a programmable feedback divider (N), a phase/frequency detector (PFD) and a low noise charge pump (CP). The clock distribution section of the LTC6950 delivers up to five outputs based on the VCO input. Each output is individually programmed to divide the VCO input frequency by any integer from 1 to 63 and to delay the output by 0 to 63 VCO clock cycles. Four of the outputs feature very low noise, low skew LVPECL logic signals capable of operation up to 1.4GHz. The fifth output is selectable as either an LVDS (800MHz) or CMOS (250MHz) logic type. This output is also programmed to produce an output signal based on either the VCO input or the reference divider output.


  • Clocking High Speed, High Resolution ADCs, DACs and Data Acquisition Systems
  • Low Jitter Clock Generation and Distribution

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Evaluation Kits (1)

Software & Systems Requirements

Evaluation Software


ClockWizard builds on PLLWizard and simplifies the evaluation process of the LTC6950. Besides the ability to design the loop filter components and predict the resulting phase noise and jitter performance, ClockWizard introduces a scope plot which shows the LTC6950 outputs in the time domain and illustrates the phase relationships between the outputs based on their respective EZSync settings. It also controls the LTC6950 demoboard via the DC590 or DC2026.

Tools & Simulations


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.

Download LTSketchbook

Purchase Linduino


IBIS Models

Product Recommendations

LTC6950 Companion Parts

Recommended µModule Receiver

Recommended ADCs

Recommended Reference Buffer

Recommended Reference Clean Up PLL

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.

PCN-PDN Information

Sample & Buy

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The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Price Table Help

Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through 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.