WM8731L WOLFSON [Wolfson Microelectronics plc], WM8731L Datasheet - Page 42

• Manufacturer Part Number: WM8731L
• Description: Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8731 / WM8731L
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The exact sample rates achieved are defined by the relationships in Table 19 below.
128/192fs NORMAL MODE
The Normal Mode sample rates are designed for standard 256fs and 384fs MCLK rates. However the
WM8731/L is also capable of being clocked from a 128 or 192fs MCLK for application over limited
sampling rates as shown in the table below.
Table 20 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 (Register 8, bit 6).
The core clock to the DSP will be divided by 2 so an external 512/768 fs MCLK will become 256/384
fs internally and the device otherwise operates as in Table 16 but with MCLK at twice the specified
rate. See Table 13 for software control.
Table 19 Normal Mode Actual Sample Rates
SAMPLING
ADC
44.1
kHz
TARGET
48
SAMPLING
RATE
kHz
44.1
88.2
32
48
96
RATE
8
DAC
44.1
kHz
48
(12.288MHz/256) x 1/6
(12.288MHz/256) x 2/3
(12.288MHz/256) x 2
MCLK=12.288
not available
not available
12.288MHz/256
FREQUENCY
kHz
5.6448
8.4672
32
48
96
MCLK
6.144
9.216
8
MHz
BOSR=0
BOSR
(11.2896MHz/256) x 2/11
(11.2896MHz/256) x 2
MCLK=11.2896
0
1
0
1
not available
11.2896MHz/256
not available
not available
8.018
44.1
88.2
ACTUAL SAMPLING RATE
kHz
SR3
REGISTER SETTINGS
0
0
1
1
SAMPLE
RATE
SR2
1
1
1
1
(18.432MHz/384) x 1/6
(18.432MHz/384) x 2/3
(18.432MHz/384) x 2
MCLK=18.432
not available
not available
18.432MHz/384
SR1
kHz
32
48
96
1
1
1
1
8
PD Rev 4.3 August 2006
BOSR=1
SR0
1
1
1
1
Production Data
(16.9344MHz/384) x 2/11
(16.9344MHz /384) x 2
MCLK=16.9344
16.9344MHz /384
not available
not available
not available
DIGITAL
FILTER
TYPE
8.018
44.1
88.2
kHz
2
2
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