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ASM3P622S01B Datasheet(PDF) 2 Page - PulseCore Semiconductor

Part No. ASM3P622S01B
Description  Low Frequency Timing-Safe™ Peak EMI reduction IC
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Manufacturer  PULSECORE [PulseCore Semiconductor]
Direct Link  http://www.onsemi.com/
Logo PULSECORE - PulseCore Semiconductor

ASM3P622S01B Datasheet(HTML) 2 Page - PulseCore Semiconductor

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May 2007
ASM3P622S01B/J
rev 0.4
Low Frequency Timing-Safe™ Peak EMI Reduction IC
2 of 12
Notice: The information in this document is subject to change without notice.
CLKOUT1
1
2
3
4
5
6
7
8
ASM3P622S01B
GND
SSON
CLKIN
VDD
CLKOUT3
SS%
CLKOUT2
XOUT
1
2
3
4
5
6
7
8
ASM3P622S01J
GND
SSON
XIN / CLKIN
VDD
CLKOUT2
SS%
CLKOUT1
Spread Spectrum Frequency Generation
The clocks in digital systems are typically square waves
with a 50% duty cycle and as frequencies increase the
edge rates also get faster. Analysis shows that a square
wave is composed of fundamental frequency and
harmonics. The fundamental frequency and harmonics
generate the energy peaks that become the source of
EMI. Regulatory agencies test electronic equipment by
measuring the amount of peak energy radiated from the
equipment. In fact, the peak level allowed decreases as
the frequency increases. The standard methods of
reducing EMI are to use shielding, filtering, multi-layer
PCBs etc. These methods are expensive. Spread
spectrum clocking reduces the peak energy by reducing
the Q factor of the clock. This is done by slowly
modulating the clock frequency. The ASM3P622S01B/J
uses the center modulation spread spectrum technique in
which the modulated output frequency varies above and
below the reference frequency
with
a specified
modulation rate. With center modulation, the average
frequency is the same as the unmodulated frequency and
there is no performance degradation.
Timing-Safe™ technology
Timing-Safe™ technology is the ability to modulate a
clock source with Spread Spectrum technology and
maintain synchronization with any associated data path.
Pin Configuration


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