NB2780A
Low Power, Reduced EMI
Clock Synthesizer
The NB2780A is a versatile spread spectrum frequency modulator
designed specifically for a wide range of clock frequencies. The
NB2780A reduces ElectroMagnetic Interference (EMI) at the clock
source, allowing system wide reduction of EMI of all clock dependent
signals. The NB2780A allows significant system cost savings by
reducing the number of circuit board layers, ferrite beads and
shielding that are traditionally required to pass EMI regulations.
The NB2780A uses the most efficient and optimized modulation
profile approved by the FCC and is implemented by using a
proprietary all digital method.
The NB2780A modulates the output of a single PLL in order to
鈥渟pread鈥?the bandwidth of a synthesized clock, and more importantly,
decreases the peak amplitudes of its harmonics. This results in
significantly lower system EMI compared to the typical narrow band
signal produced by oscillators and most frequency generators.
Lowering EMI by increasing a signal鈥檚 bandwidth is called 鈥榮pread
spectrum clock generation鈥?
The NB2780A is targeted towards all portable devices with very
low power requirements like MP3 players and digital still cameras.
Features
http://onsemi.com
MARKING
DIAGRAM*
6
1
TSOP鈭?
(TSOT鈭?3鈭?)
SN SUFFIX
CASE 318G
E07AYWG
G
1
E07
A
Y
W
G
= Specific Device Code
= Assembly Location
= Year
= Work Week
= Pb鈭扚ree Package
(Note: Microdot may be in either location)
*For additional marking information, refer to
Application Note AND8002/D.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Generates an EMI Optimized Clocking Signal at the Output
Integrated Loop Filter Components
Operates with a 3.3 V / 2.5 V Supply
Operating Current less than 5.0 mA
Low Power CMOS Design
Input Frequency Range: 30 MHz to 50 MHz for Both Voltages
Generates a 1X Low EMI Spread Spectrum clock of the Input
Frequency
鈥?/div>
Frequency Deviation
"0.75%
(TYP) @ 46 MHz
鈥?/div>
Available in TSOP鈭? Package (TSOT鈭?3鈭?)
鈥?/div>
Pb鈭扚ree Package is Available
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
漏
Semiconductor Components Industries, LLC, 2005
December, 2006
鈭?/div>
Rev. 3
1
Publication Order Number:
NB2780A/D
NB2780ASNR2G相關(guān)型號(hào)PDF文件下載
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英文版
Low Power, Reduced EMI Clock Synthesizer
ONSEMI
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英文版
3.3V / 2.5V Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
ONSEMI
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英文版
3.3V / 2.5V Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
ONSEMI
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英文版
3.3V / 2.5V Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
ONSEMI
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英文版
3.3V / 2.5V Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
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英文版
Low Power, Reduced EMI Clock Synthesizer
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