HEF4046B datasheet(9/15 Pages) PHILIPS

Part #	HEF4046B

Description	Phase-locked loop

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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9 / 15 page

January 1995

9

Philips Semiconductors

Product speciﬁcation

Phase-locked loop

HEF4046B

MSI

DESIGN INFORMATION

VCO component selection

Recommended range for R1 and R2: 10 k

Ω to 1 MΩ; for C1: 50 pF to any practical value.

1. VCO without frequency offset (R2 =

∞).

a) Given fo: use fo with Fig.7 to determine R1 and C1.

b) Given fmax: calculate fo from fo = 1⁄2 fmax; use fo with Fig.7 to determine R1 and C1.

2. VCO with frequency offset.

a) Given fo and fL : calculate fmin from the equation fmin =fo − fL; use fmin with Fig.8 to determine R2 and C1; calculate

b) Given fmin and fmax: use fmin with Fig.8 to determine R2 and C1; calculate

with Fig.9 to determine R2/R1 to obtain R1.

CHARACTERISTIC

USING PHASE COMPARATOR 1

USING PHASE COMPARATOR 2

No signal on SIGNIN

VCO in PLL system adjusts

to centre frequency (fo)

VCO in PLL system adjusts to min.

frequency (fmin)

Phase angle between

SIGNIN and COMPIN

90

° at centre frequency (fo),

approaching 0

° and 180° at

ends of lock range (2 fL)

always 0

° in lock

(positive-going edges)

Locks on harmonics of

centre frequency

yes

no

Signal input noise

rejection

high

low

Lock frequency

range (2 fL)

the frequency range of the input signal on which the loop will stay locked if it was

initially in lock; 2 fL = full VCO frequency range = fmax − fmin

Capture frequency

range (2 fC)

the frequency range of the input signal on which the loop will lock if it was initially

out of lock

depends on low-pass

ﬁlter characteristics; fC < fL

fC = fL

Centre frequency (fo)

the frequency of the VCO when VCOIN at 1⁄2VDD

f

max

f

min

-----------

from the equation

f

max

f

min

-----------

f

o

f

L

+

f

o

f

L

–

---------------

; use

f

max

f

min

-----------

with Fig. 9 to determine the ratio R2/R1 to obtain R1.

=

f

max

f

min

-----------

; use

f

max

f

min

-----------

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