參數(shù)資料
型號(hào)： FS786BZ
英文描述： MISCELLANEOUS CLOCK GENERATOR|SOP|8PIN|PLASTIC
中文描述： 雜項(xiàng)時(shí)鐘發(fā)生器|?？苵 8引腳|塑料
文件頁(yè)數(shù)： 6/13頁(yè)
文件大?。?/td> 94K
代理商： FS786BZ
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 6 of 13
APPROVED
PRODUCT
FS786/787
FS786 Loop Filter Selection Chart
The following table provides a list of recommended loop filter values for the FS786. The FS786 is divided into 2
ranges and operates at both 3.3 and 5.0 VDC. The loop filter at the right is representative of the loop filter
components in the table below.
FS786 Recommended Loop Filter Values.
C7 (pF.) @ +3.3 VDC +/- 5% (R6 = 3.3K)
Input
(MHz)
(pin 3)
(note 2)
(note 2)
(note 2)
(note 2)
16
0
10000
980
760
18
0
1200
750
580
20
0
1000
730
470
22
0
960
640
410
24
0
920
400
250
26
0
660
300
220
28
0
470
230
180
30
0
470
180
140
32
0
330
170
120
64
1
1180
860
560
65
1
1180
850
540
66
1
1180
760
560
68
1
1180
750
500
70
1
1120
740
470
72
1
1160
780
470
74
1
1110
770
470
76
1
1000
720
440
78
1
910
670
270
80
1
900
620
260
82
1
900
540
250
C7 (pF.) @ +5.0 VDC +/- 5% (R6 = 3.3K)
Input
(MHz)
(note 2)
(note 2)
(note 2)
(note 2)
16
0
2200
860
640
18
0
2200
770
575
20
0
1200
600
425
22
0
870
490
290
24
0
720
320
220
26
0
465
235
185
28
0
380
205
160
30
0
220
178
135
62
1
Note 4.
800
580
64
1
Note 4.
720
490
66
1
Note 4.
630
400
68
1
Note 4.
690
365
70
1
Note 4.
650
330
72
1
Note 4.
575
340
74
1
Note 4.
500
355
76
1
Note 4.
550
330
78
1
Note 4.
600
290
80
1
Note 4.
570
240
82
1
Note 4.
540
250
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%
BW = 3.0%
(note 2)
470
415
320
230
180
150
130
100
82
340
330
260
260
300
250
230
210
190
190
190
BW = 3.5%
(note 2)
410
370
220
200
160
140
100
80
68
290
280
220
230
240
220
210
190
170
170
170
BW = 4.0%
(note 2)
385
300
190
180
150
120
70
60
47
230
220
210
210
170
190
190
170
160
156
150
580
470
390
270
210
180
150
120
100
410
400
350
320
370
300
280
240
210
210
210
D0
BW = 1.0%
BW = 1.5%
BW = 2.0%
BW = 2.5%
BW = 3.0%
(note 2)
420
375
250
200
160
130
100
85
330
285
240
225
210
210
205
200
190
185
180
BW = 3.5%
(note 2)
375
325
170
180
140
100
90
80
250
200
150
170
190
190
180
175
170
165
160
BW = 4.0%
(note 2)
330
275
220
170
130
75
80
72
180
140
100
140
180
170
165
160
155
150
140
520
450
325
230
180
150
130
95
430
375
320
285
250
250
245
230
220
210
200
Table 7.
C8
R6
C
LF
(pin 4)
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