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WM8721 Datasheet(PDF) 22 Page - Wolfson Microelectronics plc

No. de pieza WM8721
Descripción Electrónicos  Internet Audio DAC with Integrated Headphone Driver
PDF  37 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8721 Datasheet(HTML) 22 Page - Wolfson Microelectronics plc

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WM8721 / WM8721L
Production Data
w
PD Rev 4.0 November 2004
22
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
USB/
NORMAL
0
Mode Select
1 = USB mode (250/272fs)
0 = Normal mode (256/384fs)
1
BOSR
0
Base Over-Sampling Rate
USB Mode
0 = 250fs
1 = 272fs
Normal Mode
96/88.2 kHz
0 = 256fs
0 = 128fs
1 = 384fs
1 = 192fs
0001000
Sampling
Control
5:2
SR[3:0]
0000
DAC sample rate control;
See USB Mode and Normal Mode
Sample Rate sections for operation
Table 9 Sample Rate Control
NORMAL MODE SAMPLE RATES
In normal mode MCLK is set up according to the desired sample rates of the DAC. For DAC
sampling rates of 8, 32, 48 or 96kHz, MCLK frequencies of either 12.288MHz (256fs) or 18.432MHz
(384fs) can be used. DAC sampling rates of 8, 44.1 or 88.2kHz from MCLK frequencies of either
11.2896MHz (256fs) or 16.9344MHz (384fs) can be used.
The table below should be used to set up the device to work with the various sample rate
combinations. Refer to Digital Filter Characteristics section for an explanation of the different filter
types.
SAMPLING
RATE
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
KHz
MHz
BOSR
SR3
SR2
SR1
SR0
12.288
0 (256fs)
0
0
0
0
48
18.432
1 (384fs)
0
0
0
0
1
12.288
0 (256fs)
0
0
0
1
8
18.432
1 (384fs)
0
0
0
1
1
12.288
0 (256fs)
0
1
1
0
32
18.432
1 (384fs)
0
1
1
0
1
12.288
0 (128fs)
0
1
1
1
96
18.432
1 (192fs)
0
1
1
1
2
11.2896
0 (256fs)
1
0
0
0
44.1
16.9344
1 (384fs)
1
0
0
0
1
11.2896
0 (256fs)
1
0
0
1
8
(Note 1)
16.9344
1 (384fs)
1
0
0
1
1
11.2896
0 (128fs)
1
1
1
1
88.2
16.9344
1 (192fs)
1
1
1
1
2
Table 10 Normal Mode Sample Rate Look-up Table
Notes:
1.
8k not exact, actual = 8.018kHz
2.
All other combinations of BOSR and SR[3:0] that are not in the truth table are invalid
The BOSR bit represents the base over-sampling rate. This is the rate that the WM8721 digital signal
processing is carried out at. In Normal mode, with BOSR = 0, the base over-sampling rate is at
256fs, with BOSR = 1, the base over-sampling rate is at 384fs. This can be used to determine the
actual audio data rate required by the DAC.



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