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FS781 Datasheet(PDF) 3 Page - Cypress Semiconductor

Part No. FS781
Description  Low EMI Spectrum Spread Clock
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Maker  CYPRESS [Cypress Semiconductor]
Homepage  http://www.cypress.com
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FS781 Datasheet(HTML) 3 Page - Cypress Semiconductor

 
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FS781/82/84
Document #: 38-07029 Rev. *E
Page 3 of 12
Table 2. FS781/82/84 Recommended Loop Filter Values C7 (pF) @ +3.3 VDC ±5% (R6 = 3.3K)[1, 2, 3, 4]
Input MHz S1
S0
BW = 1.0%[3] BW = 1.5%[3] BW = 2.0%[3] BW = 2.5%[3] BW = 3.0%[3] BW = 3.5%[3] BW = 4.0%[3]
6
0
0
10,000/1000
1550
910
780
700
640
560
8
0
0
10,000/330
990
820
640
520
450
400
10
0
0
1040
680
460
360
300
240
210
12
0
0
830
420
300
220
200
190
170
14
0
0
580
230
200
160
140
100
80
16
0
1
10000
980
760
580
470
410
385
18
0
1
1200
750
580
470
415
370
300
20
0
1
1000
730
470
390
320
220
190
22
0
1
960
640
410
270
230
200
180
24
0
1
920
400
250
210
180
160
150
26
0
1
660
300
220
180
150
140
120
28
0
1
470
230
180
150
130
100
70
30
0
1
470
180
140
120
100
80
60
32
0
1
330
170
120
100
82
68
47
34
1
0
10000
860
640
520
430
380
330
36
1
0
2200
820
620
470
400
330
290
38
1
0
1500
690
520
410
340
290
240
40
1
0
960
600
420
340
280
220
160
42
1
0
940
620
380
275
230
210
180
44
1
0
950
680
400
250
210
190
170
46
1
0
900
580
270
220
190
180
165
48
1
0
790
440
260
210
180
160
140
50
1
0
660
360
250
190
170
150
140
52
1
0
470
325
220
185
155
135
120
54
1
0
470
270
200
170
140
130
100
56
1
0
445
250
185
150
120
85
47
58
1
0
430
210
165
130
100
65
33
60
1
0
295
185
150
120
100
90
82
62
1
0
270
220
150
120
100
82
68
64
1
1
1180
860
560
410
340
290
230
65
1
1
1180
850
540
400
330
280
220
66
1
1
1180
760
560
350
260
220
210
68
1
1
1180
750
500
320
260
230
210
70
1
1
1120
740
470
370
300
240
170
72
1
1
1160
780
470
300
250
220
190
74
1
1
1110
770
470
280
230
210
190
76
1
1
1000
720
440
240
210
190
170
78
1
1
910
670
270
210
190
170
160
80
1
1
900
620
260
210
190
170
156
82
1
1
900
540
250
210
190
170
150
Notes:
1. If the value selected from the above chart is not a standard, use the next available larger value.
2. All bandwidths indicated above 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 bandwidth and frequency, it is not used in the loop filter.
4. Contact Cypress for LF values less than 1.0% bandwidth.


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