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LTC6909 fiches techniques PDF

Linear Dimensions Semiconductor - Multiphase Silicon Oscillator

Numéro de référence LTC6909
Description Multiphase Silicon Oscillator
Fabricant Linear Dimensions Semiconductor 
Logo Linear Dimensions Semiconductor 





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LTC6909 fiche technique
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LTC6909
1 to 8 Output, Multiphase
Silicon Oscillator with Spread
Spectrum Modulation
FEATURES
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
APPLICATIONS
Synchronizing Multiple Switching Power Supplies
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6342817, 6614313, 7417509.
DESCRIPTION
The LTC®6909 is an easy to use precision oscillator that
can provide 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-phase synchro-
nized outputs. The LTC6909 also offers spread spectrum
frequency modulation (SSFM), which can be enabled to
improve electromagnetic compatibility (EMC) perfor-
mance.
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 provides quadrature (90°) outputs.
TYPICAL APPLICATION
Providing a 4-Phase Synchronizing Clock to LTM Modules
10V TO 14V
0.1μF
0.1μF
71.5k
LTC6909
V+D OUT1
GND OUT2
V+A OUT3
SET OUT4
PH0 OUT5
PH1 OUT6
PH2 OUT7
MOD OUT8
ENABLE SSFM
0.01μF
DISABLE SSFM
INTVCC
LTM4601
S0FT-START
TRACKING
LTM4601-1
TRACKING
LTM4601-1
TRACKING
LTM4601-1
1.5V
48A
6909 TA01
150kHz to 30MHz Output
Frequency Spectrum
(9kHz Res BW)
0
SSFM DISABLED
–10
–20
–30
–40
–50
0
SSFM ENABLED
–10 SSFM = fOUT/32
–20
–30
–40
–50
150kHz
FREQUENCY
30MHz
(FUNDAMENTAL AND HARMONICS SHOWN)
6909 TA01b
6909f
1

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