MC74HC4046A

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14

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

Phase Comparator 2

Phase Comparator 3

R2 = ∞

R2 0 R

R2 = ∞

R2 0 R

R2 = ∞

R2 0 R

• Given f0

• Use f0 with

Figure 19 to

determine R1 and

C1.

(see Figure 23 for

characteristics of

the VCO operation)

• 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)

• 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)

• 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)

PACKAGE DIMENSIONS

PDIP–16

N SUFFIX

CASE 648–08

ISSUE R

MIN

MIN

MAX

MAX

INCHES

MILLIMETERS

DIM

A

B

C

D

F

G

H

J

K

L

M

S

18.80

6.35

3.69

0.39

1.02

0.21

2.80

7.50

0

°

0.51

19.55

6.85

4.44

0.53

1.77

0.38

3.30

7.74

10

°

1.01

0.740

0.250

0.145

0.015

0.040

0.008

0.110

0.295

0

°

0.020

0.770

0.270

0.175

0.021

0.070

0.015

0.130

0.305

10

°

0.040

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.

2.54 BSC

1.27 BSC

0.100 BSC

0.050 BSC

–A

–

B

18

9

16

F

H

G

S

C

–T

–

SEATING

PLANE

K

J

M

L

TA

M