Low Power, Reduced EMI
The NB2579A is a versatile spread spectrum frequency modulator
designed specifically for a wide range of clock frequencies. The
NB2579A reduces ElectroMagnetic Interference (EMI) at the clock
source, allowing system wide reduction of EMI of all clock dependent
signals. The NB2579A 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 NB2579A uses the most efficient and optimized modulation
profile approved by the FCC and is implemented by using a
proprietary all digital method.
The NB2579A 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 NB2579A is targeted towards all portable devices with very
low power requirements like MP3 players and digital still cameras.
• 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 4.0 mA
• Low Power CMOS Design
• Input Frequency Range: 13 MHz to 30 MHz
• Generates a 1X Low EMI Spread Spectrum clock of the Input
• Spread Spectrum Enable Control
• Frequency Deviation "1% @ 24 MHz
• Available in TSOP−6 Package (TSOT−23−6)
• Pb−Free Package is Available
E01 = 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.
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 3
Publication Order Number: