MC74HC4046A Datasheet, PDF (14/16 Pages) ON Semiconductor – Phase-Locked Loop

MC74HC4046A
APPLICATION INFORMATION
The following information is a guide for approximate values of R1, R2, and C1. Figures 19, 20, and 21 should be used as
references as indicated below, also the values of R1, R2, and C1 should not violate the Maximum values indicated in the DC
ELECTRICAL CHARACTERISTICS tables.
Phase Comparator 1
R2 = ∞
R2 0 R
• Given f0
• Given f0 and fL
• Use f0 with
Figure 19 to
determine R1 and
C1.
(see Figure 23 for
characteristics of
the VCO operation)
• Calculate fmin
fmin = f0–fL
• Determine values
of C1 and R2 from
Figure 20.
• Determine R1–C1
from Figure 21.
• Calculate value of
R1 from the value
of C1 and the
product of R1C1
from Figure 21.
(see Figure 24 for
characteristics of
the VCO operation)
Phase Comparator 2
R2 = ∞
R2 0 R
• Given fmax and f0
• Determine the
value of R1 and
C1 using Figure
19 and use Figure
21 to obtain 2fL
and then use this
to calculate fmin.
• Given f0 and fL
• Calculate fmin
fmin = f0–fL
• Determine values
of C1 and R2 from
Figure 20.
• Determine R1–C1
from Figure 21.
• Calculate value of
R1 from the value
of C1 and the
product of R1C1
from Figure 21.
(see Figure 24 for
characteristics of
the VCO operation)
Phase Comparator 3
R2 = ∞
R2 0 R
• Given fmax and f0
• Determine the
value of R1 and
C1 using Figure
19 and Figure 21
to obtain 2fL and
then use this to
calculate fmin.
• Given f0 and fL
• Calculate fmin:
fmin = f0–fL
• Determine values
of C1 and R2 from
Figure 20.
• Determine R1–C1
from Figure 21.
• Calculate value of
R1 from the value
of C1 and the
product of R1C1
from Figure 21.
(see Figure 24 for
characteristics of
the VCO operation)
–A
–
16
1
H
G
PACKAGE DIMENSIONS
PDIP–16
N SUFFIX
CASE 648–08
ISSUE R
9
B
8
F
C
L
S
–T
–
SEATING
PLANE
K
J
M
D 16 PL
0.25 (0.010) ^M T A ^M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
INCHES
MILLIMETERS
DIM MIN MAX MIN MAX
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.070 1.02 1.77
G
0.100 BSC
2.54 BSC
H
0.050 BSC
1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M
0° 10°
0° 10°
S 0.020 0.040 0.51 1.01
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