© Semiconductor Components Industries, LLC, 2006

December, 2006 − Rev. 3

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Publication Order Number:

NB2779A/D

NB2779A

Low Power, Reduced EMI

Clock Synthesizer

The NB2779A is a versatile spread spectrum frequency modulator

designed specifically for a wide range of clock frequencies. The

NB2779A reduces ElectroMagnetic Interference (EMI) at the clock

source, allowing system wide reduction of EMI of all clock dependent

signals. The NB2779A 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 NB2779A uses the most efficient and optimized modulation

profile approved by the FCC and is implemented by using a

proprietary all digital method.

The NB2779A 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 NB2779A is targeted towards all portable devices with very

low power requirements like MP3 players and digital still cameras.

Features

Frequency

MARKING

DIAGRAM*

*For additional marking information, refer to

Application Note AND8002/D.

TSOP−6

(TSOT−23−6)

SN SUFFIX

CASE 318G

See detailed ordering and shipping information in the package

dimensions section on page 7 of this data sheet.

ORDERING INFORMATION

http://onsemi.com

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6

E06 = Specific Device Code

A

= Assembly Location

Y

= Year

W

= Work Week

G

= Pb−Free Package

E06AYWG

G

1

(Note: Microdot may be in either location)