HCF4043BC1(1989) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

HCF4043BC1
(Rev.:1989)

MICROPOWER PHASE-LOCKED LOOP

STMicroelectronics 

HCC/HCF4046B

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 :

5kΩ ≤ R1, R2, RS ≤ 1MΩ

C1 ≥ 100pF at VDD ≥ 5V

C1 ≥ 50pF at VDD ≥ 10V

CHARACTERISTICS

USING PHASE COMPARATOR I

VCO WITHOUT

OFFSET R2 = ∞

VCO WITH

OFFSET

USING PHASE COMPARATOR II

VCO WITHOUT

OFFSET R2 = ∞

VCO WITH

OFFSET

VCO Frequency

For No Signal Input

Frequency Lock

Range, 2 fL

VCO in PLL System will Adjust to centre

VCO in PLL System will Adjust to Lowest

frequency fo

Operating Frequency fmin

2 fL = full VCO frequency range

2 fL = fmax - fmin

Frequency Capture

Range, 2 fC

Loop Filter

Component Selection

fC = fL

Phase Angle

Between Signal and

Comparator

90o at Centre Frequency (fo), approximating

0o and 180o at ends of lock range (2 fL)

Locks on Harmonics

Yes

of Centre Frequency

Signal Input Noise

High

Rejection

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

Always 0o in lock

No

Low

9/13

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