ASM3I622S00EF-16-ST datasheet(2/13 Pages) ONSEMI

Part #	ASM3I622S00EF-16-ST

Description	Low Frequency Peak EMI Reduction IC

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Manufacturer	ONSEMI [ON Semiconductor]

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ASM3P622S00B, ASM3P622S00E

http://onsemi.com

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Figure 1. General Block Diagram

SS%

DLY_CTRL

VDD

GND

SSON

PLL

CLKIN

CLKOUT(s)*

(Timing−Safe)

*For ASM3P622S00E −

8 CLKOUTS

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 ASM3P622S00B/E

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.

Zero Delay and Skew Control

All outputs should be uniformly loaded to achieve Zero

Delay between input and output. Since the CLKOUT pin is

the internal feedback to the PLL, its relative loading can

adjust the input−output delay.

For applications requiring zero input−output delay, all

outputs, including CLKOUT, must be equally loaded. Even

if CLKOUT is not used, it must have a capacitive load equal

to that on other outputs, for obtaining zero input−output

delay.

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.

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ASM3I622S00EF-16-ST Datasheet(PDF) 2 Page - ON Semiconductor

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