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LTC6909

Linear Technology
Part Number LTC6909
Manufacturer Linear Technology
Description Multiphase Silicon Oscillator
Published Apr 10, 2020
Detailed Description LTC6909 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation Features Description n 1-, 2-, ...
Datasheet PDF File LTC6909 PDF File

LTC6909
LTC6909

Overview
LTC6909 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation Features Description n 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-Phase Outputs n One External Resistor Sets the Output Frequency from 12.
5kHz to 6.
67MHz n Optional Spread Spectrum Frequency for Improved EMI Performance n ±10% Frequency Spreading n Outputs Can Be Held Low or Floated (Hi-Z) n Three Spread Spectrum Modulation Rates fOUT/16, fOUT/32 and fOUT/64 n 400µA Supply Current n Operates from a Single 2.
7V to 5.
5V Supply n Fast Start-Up Time n First Cycle Accurate n Outputs Are High Impedance Until Frequency Settles n MS16 Package Applications n Synchronizing Multiple Switching Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.
S.
Patents including 6342817, 6614313, 7417509.
The LTC®6909 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: fOUT = 20MHz • 10k/(RSET • PH) where PH = 3, 4, 5, 6, 7 or 8 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 provide...


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