CL-PS7500FE View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

CL-PS7500FE

System-on-a-Chip for Internet Appliance

VDD

470R

470R

PCOMP

33 µH

100 µF

11 pF

33 nF

VCLKI

6M8

VCLKI

Figure E-3. Suggested VCO/PLL Circuit

The actual frequency of the VCO is determined by the ratio of the v-modulus to the r-modulus as shown

in Equation E-1.

FVCO = FREF × v-r--m-m----oo---d-d---uu---ll--uu---s-s

Equation E-1

NOTE: For a modulus of r, r − 1 is programmed, and likewise for the vmodulus.

Table E-1 shows a list of useful frequencies with corresponding values of r and v moduli, assuming a ref-

erence frequency of 32 MHz. There are many values of r and v that return the same ratio. The lower the

value, the more frequently the output of the VCO is updated, so choose the r and v values to suit the

response of the filter.

June 1997

ADVANCE DATA BOOK v2.0

239

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