LTC6909
1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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Overview
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.
Applications
- Synchronizing Multiple Switching Power Supplies
Product Categories
Product Lifecycle
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)
Documentation & Resources
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R494 Reliability Data3/22/2018
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DC1446A - Demo Manual9/24/2009
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Silicon Oscillators11/17/2015
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC6909
Design Tool
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
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 |
|---|---|---|---|---|
| LTC6909CMS#PBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| LTC6909CMS#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| LTC6909HMS#PBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| LTC6909HMS#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| LTC6909IMS#PBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| LTC6909IMS#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP | |
| Wafer Fabrication Data | R494 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC6909 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
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.