74HCT4046AN NXP Semiconductors, 74HCT4046AN Datasheet - Page 26
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74HCT4046AN
Manufacturer Part Number
74HCT4046AN
Description
74HCT CMOS, 74HCT4046, DIP16, 5V
Manufacturer
NXP Semiconductors
Datasheet
1.74HCT4046AD.pdf
(34 pages)
Specifications of 74HCT4046AN
Pll Type
VCO
Frequency
21MHz
Supply Voltage Range
4.5V To 5.5V
Digital Ic Case Style
DIP
No. Of Pins
16
Operating Temperature Range
-40°C To +125°C
Svhc
No SVHC (18-Jun-2010)
Operating
RoHS Compliant
Supply Current
8µA
Rohs Compliant
Yes
Base Number
74
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
74HCT4046AN
Manufacturer:
MT
Quantity:
238
Part Number:
74HCT4046AN
Manufacturer:
PHILIPS/飞利浦
Quantity:
20 000
Philips Semiconductors
1997 Nov 25
SUBJECT
VCO frequency
PLL conditions
with extra
offset
with no signal at
the SIG
Phase-locked-loop with VCO
IN
input
PHASE
COMPARATOR
PC1, PC2 or PC3
PC1, PC2 or PC3
PC1
PC2
PC3
DESIGN CONSIDERATIONS
VCO frequency characteristic
With R1 and R2 within the ranges 3 k
3 k
shown in Fig.26.
Fig.26 Frequency characteristic of VCO operating with offset:
f
Selection of R1, R2 and C1
Given f
Calculate f
Obtain the values of C1 and R2 by using Fig.30.
Calculate the value of R1 from the value of C1 and the product R1C1.
VCO adjusts to f
VCO adjusts to f
VCO adjusts to f
o
= centre frequency; 2f
R2
o
and f
off
26
300 k , the characteristics of the VCO operation will be as
from the equation f
L
, determine the value of product R1C1 by using Fig.31.
o
o
o
with
with
with
DEMOUT
DEMOUT
DEMOUT
L
= frequency lock range.
= 360 and V
= 90 and V
= 360 and V
off
= f
o
R1
1.6f
74HC/HCT4046A
VCOIN
L
VCOIN
.
VCOIN
300 k ,
= 1/2 V
Product specification
= min. (see Fig.10).
= min. (see Fig.8).
CC
(see Fig.6).