Features and Benefits

  • 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-Phase Outputs
  • One External Resistor Sets the Output Frequency from 12.5kHz to 6.67MHz
  • Optional Spread Spectrum Frequency for Improved EMI Performance
  • ±10% Frequency Spreading
  • Outputs Can Be Held Low or Floated (Hi-Z)
  • Three Spread Spectrum Modulation Rates fOUT/16, fOUT/32 and fOUT/64
  • 400μA Supply Current
  • Operates from a Single 2.7V to 5.5V Supply
  • Fast Start-Up Time
  • First Cycle Accurate
  • Outputs Are High Impedance Until Frequency Settles
  • MS16 Package

Product Details

The LTC6909 is an easy to use precision oscillator that can provide 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-phase synchronized outputs. The LTC6909 also offers spread spectrum frequency modulation (SSFM), which can be enabled to improve electromagnetic compatibility (EMC) performance.

Eight separate outputs provide up to eight rail-to-rail, 50% duty cycle clock signals. Using three logic inputs, the outputs are configured for phase separation, ranging from 45° to 120° (three to eight phases). The clock outputs can also be held low or configured for Hi-Z. A single resistor, combined with the phase configuration, sets the output frequency, based on the following formula:

The LTC6909 can be used in applications requiring only one or two output phases. Alternatively, the LTC6908 family of parts provides the same two output signals but in a smaller SOT-23 or 2mm × 3mm DFN package. The LTC6908-1 provides complimentary (180°) outputs while the LTC6908-2 provides quadrature (90°) outputs.


  • Synchronizing Multiple Switching Power Supplies

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations


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Design Tools

OscCalc Silicon Oscillator Selection & Synthesis Tool

OscCalc is a quick and easy tool to help you find the right silicon oscillator for your application.

Product Recommendations

LTC6909 Companion Parts

Recommended Related Parts

Design Resources

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PCN-PDN Information

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Evaluation Boards

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Up to two boards can be purchased through Analog.com. 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.