參數(shù)資料
型號(hào): 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(yè)數(shù): 26/34頁(yè)
文件大小: 467K
代理商: 74HC4046A
1997 Nov 25
26
Philips Semiconductors
Product specification
Phase-locked-loop with VCO
74HC/HCT4046A
VCO frequency characteristic
With R1 and R2 within the ranges 3 k
<
R1
<
300 k
,
3 k
<
R2
<
300 k
, the characteristics of the VCO operation will be as
shown in Fig.26.
VCO frequency
with extra
offset
PC1, PC2 or PC3
Fig.26 Frequency characteristic of VCO operating with offset:
f
o
= centre frequency; 2f
L
= frequency lock range.
Selection of R1, R2 and C1
PC1, PC2 or PC3
Given f
o
and f
L
, determine the value of product R1C1 by using Fig.31.
Calculate f
off
from the equation f
off
= f
o
1.6f
L
.
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
o
with
φ
DEMOUT
= 90
°
and V
VCOIN
= 1/2 V
CC
(see Fig.6).
VCO adjusts to f
o
with
φ
DEMOUT
=
360
°
and V
VCOIN
= min. (see Fig.8).
VCO adjusts to f
o
with
φ
DEMOUT
=
360
°
and V
VCOIN
= min. (see Fig.10).
PLL conditions
with no signal at
the SIG
IN
input
PC1
PC2
PC3
SUBJECT
PHASE
COMPARATOR
DESIGN CONSIDERATIONS
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