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CDCE62002 датащи(PDF) 36 Page - Texas Instruments

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номер детали CDCE62002
подробное описание детали  Four Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs
PDF  49 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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CDCE62002 датащи(HTML) 36 Page - Texas Instruments

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Loop Filter
PFD/
CP
EXT_LFN
EXT_LFP
external
internal
external
internal
+
-
VB
C1
R2
C2
R3
C3
24
Registers 0
23
25
22
CDCE62002
SCAS882A – JUNE 2009 – REVISED JULY 2009.............................................................................................................................................................. www.ti.com
Figure 28 depicts the loop filter topology of the CDCE62002. It facilitates both internal and external
implementations providing optimal flexibility.
Figure 28. CDCE62002 Loop Filter Topology
Internal Loop Filter Component Configuration
Figure 28 illustrates the switching between four fixed internal loop filter settings and the external loop filter
setting. Table 19 shows that the CDCE62002 has 16 settings different settings for the loop filter. Four of the
settings are internal and twelve are external.
Table 19. CDCE62002 Loop Filter Settings
Charge
LFRCSEL
3 db Corner
Pump
3
2
1
0
Loop Filter
C1
C2
R2
R3
C3
C3R3
Current
0
0
0
0
Internal
1.5 pF
473.5 pF
4.0k
5k
2.5 pF
12 MHz
1.5 mA
0
0
0
1
Internal
1.5 pF
473.5 pF
4.0k
5k
2.5 pF
12 MHz
400
µA
0
0
1
0
Internal
1.5 pF
473.5 pF
2.7k
5k
2.5 pF
12 MHz
250
µA
0
0
1
1
Internal
1.5 pF
473.5 pF
2.7k
5k
2.5 pF
12 MHz
150
µA
0
1
0
0
External
X
X
X
20k
112 pF
70 kHz
1.0 mA
0
1
0
1
External
X
X
X
20k
112 pF
70 kHz
2.0 mA
0
1
1
0
External
X
X
X
20k
112 pF
70 kHz
3.0 mA
0
1
1
1
External
X
X
X
20k
112 pF
70 kHz
3.75 mA
1
0
0
0
External
X
X
X
10k
100 pF
150 kHz
1.0 mA
1
0
0
1
External
X
X
X
10k
100 pF
150 kHz
2.0 mA
1
0
1
0
External
X
X
X
10k
100 pF
150 kHz
3.0 mA
1
0
1
1
External
X
X
X
10k
100 pF
150 kHz
3.75 mA
1
1
0
0
External
X
X
X
5k
100 pF
300 kHz
1.0 mA
1
1
0
1
External
X
X
X
5k
64 pF
500 kHz
2.0 mA
1
1
1
0
External
X
X
X
5k
48 pF
700 kHz
3.0 mA
1
1
1
1
External
X
X
X
5k
38 pF
800 kHz
3.75 mA
36
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): CDCE62002



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