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  ON Semiconductor Electronic Components Datasheet  

NB2579A Datasheet

Reduced EMI Clock Synthesizer

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NB2579A pdf
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NB2579A
Low Power, Reduced EMI
Clock Synthesizer
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.
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 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
Frequency
Spread Spectrum Enable Control
Frequency Deviation "1% @ 24 MHz
Available in TSOP6 Package (TSOT236)
PbFree Package is Available
http://onsemi.com
MARKING
DIAGRAM*
6
1
TSOP6
(TSOT236)
SN SUFFIX
CASE 318G
E01AYWG
G
1
E01 = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = PbFree 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, 2006
December, 2006 Rev. 3
1
Publication Order Number:
NB2579A/D


  ON Semiconductor Electronic Components Datasheet  

NB2579A Datasheet

Reduced EMI Clock Synthesizer

No Preview Available !

NB2579A pdf
XIN/CLKIN
XOUT
Crystal
Oscillator
NB2579A
SSON
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VDD
PLL
VCO
Output
Divider
ModOUT
Table 1. KEY SPECIFICATIONS
Description
Supply Voltages
Frequency Range
CycletoCycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Figure 1. Block Diagram
VSS
Specification
VDD = 3.3 V / 2.5 V
13 MHz < CLKIN < 30 MHz
200 ps (maximum)
45/55% (worst case)
FIN/640
"1% @ 24 MHz
SSON 1
XOUT 2
XIN/CLKIN 3
NB2579A
6 VSS
5 ModOUT
4 VDD
Figure 2. Pin Configuration
Table 2. PIN DESCRIPTION
Pin #
1
2
3
4
5
6
Pin Name
SSON
XOUT
XIN/CLKIN
VDD
ModOUT
VSS
Type
I
O
I
P
O
P
Description
When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the spread
spectrum. Connect the pin to ground when the spread spectrum feature is not required.
Crystal connection. If using an external reference, this pin must be left unconnected.
Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock.
Power supply for the entire chip.
Spread spectrum clock output.
Ground connection.
http://onsemi.com
2


Part Number NB2579A
Description Reduced EMI Clock Synthesizer
Maker ON Semiconductor
Total Page 8 Pages
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