W48S101-04H 查看數據表（PDF） - Cypress Semiconductor

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W48S101-04H

Spread Spectrum Motherboard Frequency Generator

Cypress Semiconductor 

PRELIMINARY

W48S101-04

Spread Spectrum Clock Generation

The benefits of using Spread Spectrum Clock Generation are

depicted in Figure 3. An EMI emission profile of a clock har-

monic is shown.

Contrast the typical clock EMI with the Cypress Spread Spec-

trum Clock Generation. Notice the spike in the typical clock.

This spike can make systems fail quasi-peak EMI testing. The

FCC and other regulatory agencies test for peak emissions.

With the Cypress clock, the peak energy is much lower (at

least 8 dB) because the energy is spread out across a wider

bandwidth.

5dB/div

SS FTG

Typical C lock

MAX (+0.5%)

-SS% Frequency Span (MHz) +SS%

Figure 3. Typical Clock and SSCG Comparison

MIN (–0.5%)

Figure 4. Typical Modulation Profile

4

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