參數(shù)資料
型號: 74HC4046A
廠商: NXP Semiconductors N.V.
英文描述: Phase-locked-loop with VCO
中文描述: 鎖相環(huán)與VCO的環(huán)
文件頁數(shù): 25/34頁
文件大?。?/td> 467K
代理商: 74HC4046A
1997 Nov 25
25
Philips Semiconductors
Product specification
Phase-locked-loop with VCO
74HC/HCT4046A
APPLICATION INFORMATION
This information is a guide for the approximation of values of external components to be used with the 74HC/HCT4046A
in a phase-lock-loop system.
References should be made to Figs 29, 30 and 31 as indicated in the table.
Values of the selected components should be within the following ranges:
R1
R2
R1 + R2 parallel value
>
2.7 k
;
C1
greater than 40 pF.
between 3 k
and 300 k
;
between 3 k
and 300 k
;
SUBJECT
PHASE
COMPARATOR
DESIGN CONSIDERATIONS
VCO frequency characteristic
With R2 =
and R1 within the range 3 k
<
R1
<
300 k
, the
characteristics of the VCO operation will be as shown in Fig.25.
(Due to R1, C1 time constant a small offset remains when R2 =
.).
VCO frequency
without extra
offset
PC1, PC2 or PC3
Fig.25 Frequency characteristic of VCO operating without offset:
f
0
= centre frequency; 2f
L
= frequency lock range.
Selection of R1 and C1
PC1
PC2 or PC3
Given f
o
, determine the values of R1 and C1 using Fig.29.
Given f
max
and f
o
, determine the values of R1 and C1 using Fig.29, use
Fig.31 to obtain 2f
L
and then use this to calculate f
min
.
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