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CDCE421 データシート(PDF) 3 Page - Texas Instruments

部品番号 CDCE421
部品情報  Fully Integrated Wide-Range, Low-Jitter, Crystal-Oscillator Clock Generator
PDF  30 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

CDCE421 データシート(HTML) 3 Page - Texas Instruments

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DEVICE SETUP AND CONFIGURATION
CDCE421
SCAS842 – APRIL 2007
Table 1. Crystal Frequency Selection and Device Settings
REQUIRED INPUT
DESIRED OUTPUT
CRYSTAL
VCO
OUTPUT
PRESCALER
FEEDBACK
FREQUENCY (MHz)
FREQUENCY (MHz)
SELECTION
DIVIDER
SETTING
DIVIDER(1)
From
To
From
To
1020.0
1175.0
31.875
36.719
VCO 2
1
2
32
875.2 (2)
1020.0
27.351
31.875
VCO 1
1
2
32
650.0
766.7 (2)
32.500
38.333
VCO 2
1
3
20
583.5
650.0
29.174
32.500
VCO 1
1
3
20
510.0
587.5
31.875
36.719
VCO 2
1
4
16
437.6
510.0
27.351
31.875
VCO 1
1
4
16
408.0
460.0
34.000
38.333
VCO 2
1
5
12
350.1
408.0
29.174
34.000
VCO 1
1
5
12
340.0
383.3
34.000
38.333
VCO 2
2
3
20
291.7
340.0
29.174
34.000
VCO 1
2
3
20
255.0
293.8
31.875
36.719
VCO 2
2
4
16
218.8
255.0
27.351
31.875
VCO 1
2
4
16
204.0
230.0
34.000
38.333
VCO 2
2
5
12
175.0
204.0
29.174
34.000
VCO 1
2
5
12
170.0
191.7
34.000
38.333
VCO 2
4
3
20
145.9
170.0
29.174
34.000
VCO 1
4
3
20
127.5
146.9
31.875
36.719
VCO 2
4
4
16
109.4
127.5
27.351
31.875
VCO 1
4
4
16
102.0
115.0
34.000
38.333
VCO 2
4
5
12
87.5
102.0
29.174
34.000
VCO 1
4
5
12
85.0
95.8
34.000
38.333
VCO 2
8
3
20
72.9
85.0
29.174
34.000
VCO 1
8
3
20
63.8
73.4
31.875
36.719
VCO 2
8
4
16
54.7
63.8
27.351
31.875
VCO 1
8
4
16
51.0
57.5
34.000
38.333
VCO 2
8
5
12
43.8
51.0
29.174
34.000
VCO 1
8
5
12
42.5
47.9
34.000
38.333
VCO 2
16
3
20
36.5
42.5
29.174
34.000
VCO 1
16
3
20
31.9
36.7
31.875
36.719
VCO 2
16
4
16
27.4
31.9
27.351
31.875
VCO 1
16
4
16
25.5
28.8
34.000
38.333
VCO 2
16
5
12
21.9
25.5
29.174
34.000
VCO 1
16
5
12
21.3
24.0
34.000
38.333
VCO 2
32
3
20
18.2
21.3
29.174
34.000
VCO 1
32
3
20
15.9
18.4
31.875
36.719
VCO 2
32
4
16
13.7
15.9
27.351
31.875
VCO 1
32
4
16
12.8
14.4
34.000
38.333
VCO 2
32
5
12
10.9
12.8
29.174
34.000
VCO 1
32
5
12
(1)
The feedback divider is set automatically with respect to the prescaler setting.
(2)
Discontinuity in frequency range
3
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