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U74HC4046AL-S16-R датащи(PDF) 17 Page - Unisonic Technologies

номер детали U74HC4046AL-S16-R
подробное описание детали  PHASE LOCKED LOOP WITH VCO
PDF  19 Pages
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

U74HC4046AL-S16-R датащи(HTML) 17 Page - Unisonic Technologies

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U74HC4046A
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
17 of 19
www.unisonic.com.tw
QW-R502-461.D
APPLICATION INFORMATION(Cont.)
PLL Frequency Capture Range
(Phase comparator: PC1, PC2 or PC3)
Loop filter component selection
)
(
F
j
A small capture range (2fC) is obtained if
/
f
2
1
f
2
L
C
Fig.13 Simple loop filter for PLL without offset; R3 ≥ 500 Ω.
R3
C2
INPUT
OUTPUT
(a)
R4
1/ 3
1/ 2
m
)
(
F
j
(b) Amplitude Characteristic
(c) Pole-Zero Diagram
1 = R3 × C2
2 = R4 × C2
3 = (R3 + 4)× C2
-1/ 2
-1/ 3
R4
R3
R4
m
Fig.14 Simple loop filter for PLL with offset; R3 + R4 ≥ 500 Ω.
Subject
Phase comparator Design considerations
PC1 or PC3
Yes
PLL Locks on Harmonics at Centre Frequency
PC2
No
PC1
High
Noise Rejection at Signal Input
PC2 or PC3
Low
PC1
fr = 2fi, large ripple content at φDEMOUT = 90°
PC2
fr = fi, small ripple content at φDEMOUT = 0°
AC Ripple Content when PLL is Locked
PC3
fr = fi, large ripple content at φDEMOUT = 180°



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