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WM8974 データシート(PDF) 46 Page - Wolfson Microelectronics plc

部品番号 WM8974
部品情報  MONO CODEC WITH SPEAKER DRIVER
PDF  63 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8974 データシート(HTML) 46 Page - Wolfson Microelectronics plc

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WM8974
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PP Rev 1.1 September 2004
46
u-law Companding
0
20
40
60
80
100
120
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Normalised Input
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Table 34 u-Law Companding
A-law Companding
0
20
40
60
80
100
120
0
0.2
0.4
0.6
0.8
1
Normalised Input
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Table 35 A-Law Companding
AUDIO SAMPLE RATES
The WM8974 sample rates for the ADC and the DAC are set using the SR register bits. The cutoffs
for the digital filters and the ALC attack/decay times stated are determined using these values and
assume a 256fs master clock rate.
If a sample rate that is not explicitly supported by the SR register settings is required then the
closest SR value to that sample rate should be chosen, the filter characteristics and the ALC attack,
decay and hold times will scale appropriately.



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