LTC6909

PRODUCTION

1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Part Models: 6
1ku List Price: Starting From $3.10

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Overview

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 f_OUT/16, f_OUT/32 and f_OUT/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

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

Part Models: 6
1ku List Price: Starting From $3.10

Documentation

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
LTC6909CMS#PBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC6909CMS#TRPBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC6909HMS#PBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC6909HMS#TRPBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC6909IMS#PBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC6909IMS#TRPBF	16-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC6909CMS#PBF	PRODUCTION
LTC6909CMS#TRPBF	PRODUCTION
LTC6909HMS#PBF	PRODUCTION
LTC6909HMS#TRPBF	PRODUCTION
LTC6909IMS#PBF	PRODUCTION
LTC6909IMS#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC6909CMS#PBF	PRODUCTION
LTC6909CMS#TRPBF	PRODUCTION
LTC6909HMS#PBF	PRODUCTION
LTC6909HMS#TRPBF	PRODUCTION
LTC6909IMS#PBF	PRODUCTION
LTC6909IMS#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 1
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC6909

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