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WM8731 датащи(PDF) 39 Page - Wolfson Microelectronics plc

номер детали WM8731
подробное описание детали  Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates
PDF  56 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8731 датащи(HTML) 39 Page - Wolfson Microelectronics plc

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WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
39
The exact sample rates achieved are defined by the relationships in Table 18 below.
ACTUAL SAMPLING RATE
BOSR=0
(256fs)
BOSR=1
(384fs)
TARGET
SAMPLING
RATE
MCLK=12.288
MCLK=11.2896
MCLK=18.432
MCLK=16.9344
kHz
kHz
kHz
kHz
kHz
8
8.018
8
8.018
8
12.288MHz/256 x 1/6
11.2896MHz/256 x 2/11
18.432MHz/384 x 1/6
16.9344MHz/384 x 2/11
32
32
32
12.288MHz/256 x 2/3
not available
18.432MHz/384x 2/3
not available
44.1
44.1
44.1
not available
11.2896MHz/256
not available
16.9344MHz /384
48
48
48
12.288MHz/256
not available
18.432MHz/384
not available
88.2
88.2
88.2
not available
11.2896MHz/384 x 2
not available
16.9344MHz /384 x 2
96
96
96
12.288MHz/256 x 2
not available
18.432MHz/384 x 2
not available
Table 18 Normal Mode Actual Sample Rates
128/192fs NORMAL MODE
The Normal Mode sample rates are designed for standard 256fs and 384fs MCLK rates. However the
WM8731 is also capable of being clocked from a 128 or 192fs MCLK for application over limited
sampling rates as shown in the table below.
SAMPLING
RATE
ADC
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
kHz
kHz
MHz
BOSR
SR3
SR2
SR1
SR0
6.144
0
0
1
1
1
48
48
9.216
1
0
1
1
1
2
5.6448
0
1
1
1
1
44.1
44.1
8.4672
1
1
1
1
1
2
Table 19 128fs Normal Mode Sample Rate Look-up Table
512/768fs NORMAL MODE
512 fs and 768 fs MCLK rates can be accommodated by using the CLKIDIV2 bit. The core clock to
the DSP will be divided by 2 so an external 512/768 MCLK will become 256/384 fs internally and the
device otherwise operates as in Table 15 but with MCLK at twice the specified rate. See Table 12 for
software control.



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