DESIGN INFORMATION

This information is a guide for approximating the values of external components for the HCC/HCF 4046B in

a Phase-Locked-Loop system. The selected external components must be within the following ranges :

5k

C1

C1

CHARACTERISTICS

USING PHASE COMPARATOR I

USING PHASE COMPARATOR II

VCO WITHOUT

OFFSET R2 =

∞

VCO WITH

OFFSET

VCO WITHOUT

OFFSET R2 =

∞

VCO WITH

OFFSET

VCO Frequency

For No Signal Input

VCO in PLL System will Adjust to centre

VCO in PLL System will Adjust to Lowest

Frequency Lock

Frequency Capture

Loop Filter

Component Selection

Phase Angle

Between Signal and

Comparator

90

0

Always 0

Locks on Harmonics

of Centre Frequency

Yes

No

Signal Input Noise

Rejection

High

Low

* G.S. Mosckytz ”miniaturized RC fil ters using phase Lockedloop” BSTJ, may 1965

HCC/HCF4046B

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