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NB2762A Datasheet

Reduced EMI Clock Synthesizer

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NB2762A
Low Power, Reduced EMI
Clock Synthesizer
The NB2762A is a versatile spread spectrum frequency modulator
designed specifically for a wide range of clock frequencies. The
NB2762A reduces ElectroMagnetic Interference (EMI) at the clock
source, allowing system wide reduction of EMI of all clock dependent
signals. The NB2762A 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 NB2762A uses the most efficient and optimized modulation
profile approved by the FCC and is implemented by using a
proprietary all digital method.
The NB2762A 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 NB2762A is targeted towards all portable devices with very
low power requirements like MP3 players and digital still cameras.
Features
ăGenerates an EMI Optimized Clocking Signal at the Output
ăIntegrated Loop Filter Components
ăOperates with a 3.3 V / 2.5 V Supply
ăOperating Current less than 3.0 mA
ăLow Power CMOS Design
ăInput Frequency Range: 6.0 MHz to 12 MHz for 2.5 V
Input Frequency Range: 6.0 MHz to 13 MHz for 3.3 V
ăGenerates a 1X Low EMI Spread Spectrum clock of the Input
Frequency
ăFrequency Deviation -1.25% (TYP) @ 10 MHz
ăAvailable in TSOP-6 Package (TSOT-23-6)
ăPb-Free Package is Available
www.DataSheet4U.com
http://onsemi.com
MARKING
DIAGRAM*
6
1
TSOP-6
(TSOT-23-6)
SN SUFFIX
CASE 318G
E04AYWG
G
1
E04 = 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.
©Ă Semiconductor Components Industries, LLC, 2006
December, 2006 - Rev. 3
1
Publication Order Number:
NB2762A/D


  ON Semiconductor Electronic Components Datasheet  

NB2762A Datasheet

Reduced EMI Clock Synthesizer

No Preview Available !

XIN/CLKIN
XOUT
Crystal
Oscillator
NB2762A
PD
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VDD
PLL
www.DataSheet4U.com
VCO
Output
Divider
ModOUT
Table 1. KEY SPECIFICATIONS
Supply Voltages
Frequency Range
Description
Cycle-to-Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
Figure 1. Block Diagram
VSS
For 2.5 V Supply
For 3.3 V Supply
Specification
VDD = 3.3 V / 2.5 V
6 MHz < CLKIN < 12 MHz
6 MHz < CLKIN < 13 MHz
200 ps (maximum)
45/55% (worst case)
FIN/256
-1.25% (TYP) @ 10 MHz
PD 1
XOUT 2
XIN/CLKIN 3
NB2762A
6 VSS
5 ModOUT
4 VDD
Figure 2. Pin Configuration
Table 2. PIN DESCRIPTION
Pin #
1
2
3
4
5
6
Pin Name
PD
XOUT
XIN/CLKIN
VDD
ModOUT
VSS
Type
Description
I Powerdown control pin. Pull low to enable powerdown mode. Connect to VDD if not used.
O Crystal connection. If using an external reference, this pin must be left unconnected.
I 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.
P Power supply for the entire chip.
O Spread spectrum clock output.
P Ground connection.
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2


Part Number NB2762A
Description Reduced EMI Clock Synthesizer
Maker ON Semiconductor
Total Page 8 Pages
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