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WM8721 Datasheet(PDF) 22 Page - Wolfson Microelectronics plc

Part # WM8721
Description  Internet Audio DAC with Integrated Headphone Driver
PDF  34 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8721 Datasheet(HTML) 22 Page - Wolfson Microelectronics plc

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WM8721
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WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 November 2000
22
The exact sample rates achieved are defined by the relationships in Table 11 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 11 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 WM8721 is also capable of being clocked from a 128/192Fs 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 12 128/192Fs 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 9 but with MCLK at twice the specified rate.



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