Spread-Spectrum Clock Generators

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Figure 1. Spread-Spectrum Frequency Modulation (Down Dithered)

Figure 2. Spread-Spectrum Frequency Modulation (Center Dithered)

DOWN DITHERED (MAX31D80)

IF SMSEL0 = SMSEL1 = 0

FREQUENCY

TIME

DITHER AMOUNT

(-0.25% TO -3.0%)

1

DITHER CYCLE

RATE

CENTER DITHERED (MAX31C80)

IF SMSEL0 = SMSEL1 = 0

FREQUENCY

TIME

DITHER AMOUNT

(±0.25% TO ±1.5%)

1

DITHER CYCLE

RATE