82C931 Datasheet, PDF (30/64 Pages) List of Unclassifed Manufacturers – Plug and Play Integrated Audio Controller

82C931
4.3 Frequency Synthesizer
The Frequency Synthesizer (FS) block generates the codec
sampling clock from a reference crystal oscillator of
14.318MHz. The output frequency of the FA is equal to 256
times fs (where fs = codec sampling frequency).
One of the 236 frequencies may be generated by the FS. The
selection of the FS output frequency is done via programming
eight register bits in the Digital Audio Processor Write Com-
mand/Data (40h/FSEL[7:0]).
Table 4-1 gives the Frequency Selection, where the
FSEL[7:0] address is given in decimal equivalent. FOUT-
actual is the FS output frequency for a given FSEL code and
%error gives the difference between the FOUT-actual and
the target FOUT-spec.
Shaded table entries refer to the 14 critical sampling frequen-
cies. The error for these frequencies fall within ±0.15%.
Table 4-1 FS Output Frequencies
FOUT-actual
FSEL
(Hz)
FOUT-actual
FSEL
(Hz)
FOUT-actual
FSEL
(Hz)
0
3909.064
1
3924.890
2
3938.710
3
3947.978
4
3951.554
5
3957.289
6
3994.978
7
4030.968
8
4033.391
9
4047.543
10
4067.614
11
4084.752
12
4092.416
13
4112.477
14
4131.170
15
4142.940
16
4164.977
17
4178.655
18
4209.761
19
4221.108
20
4237.097
21
4255.520
22
4276.976
23
4302.284
24
4302.284
25
4327.892
26
4350.087
27
4369.507
28
4386.642
29
4415.502
30
4433.451
31
4448.952
32
4462.475
33
4488.185
34
4500.090
35
4523.725
36
4544.287
37
4565.689
38
4584.401
39
4601.810
40
4605.974
41
4609.590
42
4660.807
43
4713.176
44
4716.962
45
4739.804
46
4759.973
47
4783.460
48
4806.457
49
4833.430
50
4847.240
51
4877.589
52
4906.113
53
4934.972
54
4955.795
55
4971.528
56
4993.722
57
5019.331
58
5049.208
59
5084.517
60
5115.520
61
5126.888
62
5151.419
63
5178.675
64
5202.762
65
5243.408
66
5268.739
67
5290.646
68
5326.637
69
5346.220
70
5377.855
71
5412.550
72
5437.608
73
5456.555
74
5493.094
75
5514.194
76
5519.377
77
5523.920
78
5592.969
79
5668.549
80
5680.359
81
5720.082
82
5746.201
83
5785.830
84
5804.024
85
5843.400
86
5887.335
87
5915.640
88
5949.967
89
5992.466
90
6023.197
91
6059.049
92
6101.420
93
6138.624
94
6168.715
95
6214.410
96
6260.786
97
6292.090
98
6331.663
99
6377.947
100 6408.610
101 6453.425
102 6491.839
103 6544.963
104 6579.963
105 6615.339
106 6670.513
107 6711.562
108 6750.135
109 6802.259
110 6848.533
111 6895.441
112 6935.281
113 6991.211
114 7049.961
115 7089.679
116 7139.960
117 7190.960
118 7250.145
119 7295.177
120 7359.169
121 7402.459
122 7457.292
123 7512.943
124 7573.812
125 7626.775
126 7690.332
127 7752.630
128 7813.706
FOUT-actual
FSEL
(Hz)
129 7877.421
130 7935.969
131 7989.955
132 8066.782
133 8129.315
134 8196.592
135 8262.340
136 8329.953
137 8389.453
138 8474.195
139 8544.813
140 8636.202
141 8691.776
142 8773.284
143 8849.634
144 8924.950
145 9005.628
146 9088.574
147 9175.964
148 9219.179
149 9321.614
150 9433.923
151 9519.947
152 9599.872
153 9710.015
154 9805.854
155 9904.215
156 10025.133
157 10098.416
158 10209.387
159 10302.837
160 10418.275
161 10532.214
162 10634.518
163 10755.709
164 10875.217
165 10986.188
166 11028.389
167 11263.617
168 11360.718
169 11485.561
170 11616.166
171 11774.671
FOUT-actual
FSEL
(Hz)
172 11910.952
173 12046.394
174 12189.804
175 12356.559
176 12494.931
177 12663.325
178 12817.220
179 12983.677
180 13159.926
181 13332.077
182 13511.104
183 13697.066
184 13866.865
185 14099.921
186 14286.387
187 14487.810
188 14703.165
189 14914.583
190 15147.624
191 15380.664
192 15627.413
193 15871.938
194 16018.697
195 16379.408
196 16665.917
197 16948.390
198 17244.987
199 17537.275
200 17839.642
201 18177.148
202 18511.939
203 18905.810
204 19225.830
205 19617.129
206 20034.515
207 20418.775
208 20836.550
209 21286.672
210 21750.434
211 22049.203
212 22721.435
213 23238.391
214 23821.904
FOUT-actual
FSEL
(Hz)
215 24394.863
216 24989.860
217 25634.440
218 26303.566
219 27446.976
220 27703.490
221 28566.238
222 29417.563
223 30295.247
224 31254.825
225 32007.953
226 33080.364
227 34502.080
228 35691.971
229 37053.418
230 38003.505
231 40005.262
232 41693.039
233 44098.407
234 45495.044
235 48006.315
OPTi
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912-3000-035
Revision: 2.1