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HEF4046B Datasheet(PDF) 9 Page - NXP Semiconductors

Part # HEF4046B
Description  Phase-locked loop
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

HEF4046B Datasheet(HTML) 9 Page - NXP Semiconductors

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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 = 12 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 12VDD
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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