參數(shù)資料
型號(hào)： FS787BZ
英文描述： MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
中文描述： 雜項(xiàng)時(shí)鐘發(fā)生器|專科| 8引腳|塑料
文件頁(yè)數(shù)： 7/13頁(yè)
文件大?。?/td> 94K
代理商： FS787BZ
Low EMI Spread Spectrum Clock
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress
Document#: 38-07031 Rev. **
05/04/2001
Page 7 of 13
APPROVED
PRODUCT
FS786/787
FS787 Loop Filter Selection Chart
The following table provides a list of recommended loop filter values for the FS787. The FS787 is divided into 2
ranges and operates at both 3.3 and 5.0 VDC. Refer to the Loop Filter schematic on previous page for
component references.
FS787 Recommended Loop Filter Values.
C7 (pF.) @ +3.3 VDC +/- 5% (R6 = 3.3K)
Input
(MHz)
(note 2)
(note 2)
(note 2)
6
0
10,000/1000
1500
880
8
0
10,000/330
960
790
10
0
1000
660
440
12
0
800
410
290
14
0
560
220
190
34
1
10000
860
640
36
1
2200
820
620
38
1
1500
690
520
40
1
960
600
420
42
1
940
620
380
44
1
950
680
400
46
1
900
580
270
48
1
790
440
260
50
1
660
360
250
52
1
470
325
220
54
1
470
270
200
56
1
445
250
185
58
1
430
210
165
60
1
295
185
150
62
1
270
220
150
C7 (pF.) @ +5.0 VDC +/- 5% (R6 = 3.3K)
Input
(MHz)
(note 2)
(note 2)
(note 2)
6
0
1110
1000
900
8
0
1130
940
720
10
0
1000
640
420
12
0
740
330
220
14
0
440
230
170
32
1
Note 4.
900
670
34
1
Note 4.
890
635
36
1
Note 4.
870
600
38
1
Note 4.
795
500
40
1
Note 4.
720
410
42
1
930
610
320
44
1
710
500
230
46
1
1000
375
255
48
1
1000
250
180
50
1
750
300
180
52
1
500
310
185
54
1
460
250
165
56
1
420
190
145
58
1
405
200
225
60
1
385
220
110
Notes:
1.
If the value selected from the above chart is not a standard value, use the next available larger value.
2.
All bandwidths indicated are total peak-to-peak spread. 1% = +0.5% to
–
0.5%. 4% = +2.0% to
–
2.0%.
3.
If C8 is not listed in the chart for a particular BW and Freq., it is not used in the loop filter.
4.
Contact Factory for these Loop Filter values and bandwidths less than 1.0%.
D0
BW = 1.0%
BW = 1.5%
BW = 2.0%
BW = 2.5%
(note 2)
750
620
350
215
150
520
470
410
340
275
250
220
210
190
185
170
150
130
120
120
BW = 3.0%
(note 2)
680
500
290
195
130
430
400
340
280
230
210
190
180
170
155
140
120
100
100
100
BW = 3.5%
(note 2)
620
430
230
180
100
380
330
290
220
210
190
180
160
150
135
130
85
65
90
82
BW = 4.0%
(note 2)
540
390
200
160
75
330
290
240
160
180
170
165
140
140
120
100
47
33
82
68
D0
BW = 1.0%
BW = 1.5%
BW = 2.0%
BW = 2.5%
(note 2)
800
550
340
190
135
510
470
430
345
260
230
200
185
170
160
155
130
110
95
80
BW = 3.0%
(note 2)
690
450
270
170
100
420
380
340
276
212
196
180
165
150
140
130
100
90
80
75
BW = 3.5%
(note 2)
590
390
200
150
70
370
325
280
242
204
184
170
150
130
120
110
97
85
75
70
BW = 4.0%
(note 2)
490
270
130
130
47
330
270
210
202
194
172
150
130
110
100
85
82
80
70
60
Table 8.
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