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LTC6909CMS-PBF

更新时间： 2024-09-15 11:47:31
品牌 Logo 应用领域
凌特 - Linear 振荡器
页数 文件大小 规格书
20页 276K
描述
1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

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LTC6909CMS-PBF 数据手册

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LTC6909  
1 to 8 Output, Multiphase  
Silicon Oscillator with Spread  
Spectrum Modulation  
FEATURES  
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.  
■
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  
1ꢀ0 Frequency Spreadinꢁ  
Outputs Can Be Held Low or Floated (Hi-Z)  
Three Spread Spectrum Modulation Rates  
■
■
■
Eight separate outputs provide up to eight rail-to-rail,  
50%dutycycleclocksignals. Usingthreelogicinputs, the  
outputsareconfiguredforphaseseparation,rangingfrom  
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:  
■
f
/16, f /32 and f /64  
OUT  
OUT OUT  
■
■
■
■
■
■
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  
f
= 20MHz • 10k/(R  
• PH)  
OUT  
SET  
where PH = 3, 4, 5, 6, 7 or 8  
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.  
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  
150kHz to 30MHz Output  
Frequency Spectrum  
(9kHz Res BW)  
Providing a 4-Phase Synchronizing Clock to LTM Modules  
0
–10  
–20  
SSFM DISABLED  
10V TO 14V  
INTV  
CC  
LTM4601  
S0FT-START  
0.1μF  
LTC6909  
–30  
–40  
–50  
+
1.5V  
48A  
V D  
OUT1  
OUT2  
OUT3  
OUT4  
OUT5  
OUT6  
OUT7  
OUT8  
GND  
TRACKING  
TRACKING  
TRACKING  
+
LTM4601-1  
V A  
71.5k  
SET  
PH0  
PH1  
PH2  
MOD  
0.1μF  
0
–10  
–20  
SSFM ENABLED  
SSFM = f /32  
OUT  
LTM4601-1  
LTM4601-1  
–30  
–40  
–50  
6909 TA01  
ENABLE SSFM  
0.01μF  
DISABLE SSFM  
150kHz  
30MHz  
FREQUENCY  
(FUNDAMENTAL AND HARMONICS SHOWN)  
6909 TA01b  
6909f  
1
1234567...20

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