IDT5V9885BNLGI datasheet(9/37 Pages) IDT

Part #	IDT5V9885BNLGI

Description	3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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9

INDUSTRIALTEMPERATURERANGE

IDT5V9885B

3.3V EEPROMPROGRAMMABLECLOCKGENERATOR

Modulation frequency:

FPFD = FIN / D (Eq. 11)

FVCO = FPFD * MNOM (Eq. 12)

FSSC = FPFD / (4 * Nssc * Tssc)

(Eq. 13)

Spread:

ΣΔ = SD0 + SD1 + SD2 + … + SD11

the number of samples used depends on the NSSC value

ΣΔ ≤ 63 - SS_OFFSET

±Spread% =

ΣΔ * 100

(Eq. 14)

64 * (2*N[11:0] + A{3:0} + 1)

±Max Spread% / 100 = 1 / MNOM or 2 / MNOM (X2=1)

Profile:

Waveform starts with SS_OFFSET, SS_OFFSET + SDJ, SS_OFFSET + SDJ+1, etc.

Spread Spectrum Using Sinusoidal Profile

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