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NB2780A Datasheet PDF : 8 Pages
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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
“spread” 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’s bandwidth is called ‘spread
spectrum clock generation’.
The NB2780A is targeted towards all portable devices with very
low power requirements like MP3 players and digital still cameras.
Features
• 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
• Frequency Deviation "0.75% (TYP) @ 46 MHz
• Available in TSOP−6 Package (TSOT−23−6)
• Pb−Free Package is Available
http://onsemi.com
MARKING
DIAGRAM*
6
1
TSOP−6
(TSOT−23−6)
SN SUFFIX
CASE 318G
E07AYWG
G
1
E07 = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
*For additional marking information, refer to
Application Note AND8002/D.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2005
1
December, 2006 − Rev. 3
Publication Order Number:
NB2780A/D
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