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參數(shù)資料
| 型號(hào)： | SC14046BDWG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | 4000/14000/40000 SERIES, PLL BASED CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, SOIC-16 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大小： | 136K |
| 代理商： | SC14046BDWG |
SC14046B
http://onsemi.com
6
Typical LowPass Filters
NOTE: Sometimes R3 is split into two series resistors each R3 ÷ 2. A capacitor CC is then placed from the midpoint to ground. The value for
CC should be such that the corner frequency of this network does not significantly affect Wn. In Figure B, the ratio of R3 to R4 sets
the damping, R4 ^ (0.1)(R3) for optimum results.
Figure 3. General PhaseLocked Loop Connections and Waveforms
Waveforms
Note: for further information, see:
(1) F. Gardner, “PhaseLock Techniques”, John Wiley and Son, New York, 1966.
(2) G. S. Moschytz, “Miniature RC Filters Using PhaseLocked Loop”, BSTJ, May, 1965.
(3) Garth Nash, “PhaseLock Loop Design Fundamentals”, AN535, Motorola Inc.
(4) A. B. Przedpelski, “PhaseLocked Loop Design Articles”, AR254, reprinted by Motorola Inc.
PCAin
@ FREQUENCY f
′
PCBin
14
3
PHASE
COMPARATOR
EXTERNAL
LOW-PASS
FILTER
VCO
2 OR 13
PC1out
OR
PC2out
VCOin
9
10
4
EXTERNAL
÷ N
COUNTER
R1
R2
11
12
6
7
CIA
CIB
CI
SFout
RSF
VCOout
@ FREQUENCY Nf
′ = f
(a)
INPUT
R3
OUTPUT
C2
2fC [ 1p
2 pfL
R3 C2
(a)
INPUT
R3
OUTPUT
R4
C2
Typically:
R4 C2 +
6N
fmax
N
2 pD f
(R3 ) 3, 000W)C2 + 100NDf
fmax2
R4 C2
D f = fmax fmin
Definitions: N = Total division ratio in feedback loop
Kφ = VDD/π for Phase Comparator 1
Kφ = VDD/4 π for Phase Comparator 2
KVCO +
2 pD fVCO
VDD 2V
2 p fr
10
for a typical design Wn ^
(at phase detector input)
ζ ^ 0.707
LOWPASS FILTER
Filter A
Filter B
wn +
KfKVCO
NR3C2
z +
Nwn
2KfKVCO
F(s) +
1
R3C2S ) 1
wn +
KfKVCO
NC2(R3 ) R4)
z + 0.5 wn (R3C2 )
N
KfKVCO
)
F(s) +
R3C2S ) 1
S(R3C2 ) R4C2) ) 1
PCAin
PCBin
PC1out
VCOin
VDD
VSS
VOH
VOL
VOH
VOL
VOH
VOL
PCAin
PCBin
PC2out
VCOin
LD
VDD
VSS
VOH
VOL
VOH
VOL
VOH
VOL
VOH
Phase Comparator 1
Phase Comparator 2
SOURCE
FOLLOWER
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