參數(shù)資料
型號: 74HC7046A
廠商: NXP Semiconductors N.V.
英文描述: Phase-locked-loop with lock detector
中文描述: 鎖相回路鎖定探測器
文件頁數(shù): 27/38頁
文件大?。?/td> 490K
代理商: 74HC7046A
December 1990
27
Philips Semiconductors
Product specification
Phase-locked-loop with lock detector
74HC/HCT7046A
APPLICATION INFORMATION
This information is a guide for the approximation of values of external components to be used with the 74HC/HCT7046
in a phase-lock-loop system.
References should be made to Figs 27, 28 and 29 as indicated in the table.
Values of the selected components should be within the following ranges
:
R1
R2
R1
+
R2
C1
between 3 k
and 300 k
;
between 3 k
and 300 k
;
parallel value
>
2.7 k
;
greater than 40 pF.
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. 23.
(Due to R1, C1 time constant a small offset remains when R2 =
.)
VCO frequency
without extra
offset
PC1, PC2
Fig. 23 Frequency characteristic of VCO operating without offset:
f
o
L
= frequency lock range.
Selection of R1 and C1
PC1
PC2
Given f
o
, determine the values of R1 and C1 using Fig.27.
Given f
max
and f
o
, determine the values of R1 and C1 using Fig.27,
use Fig.29 to obtain 2f
L
and then use this to calculate f
min.
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