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WM8976 Datasheet(PDF) 30 Page - Wolfson Microelectronics plc

Part # WM8976
Description  Low Power CODEC With Speaker Driver
PDF  83 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 Datasheet(HTML) 30 Page - Wolfson Microelectronics plc

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WM8976
Preliminary Technical Data
w
PTD Rev 2.0 February 2005
30
The polarity of the output signal can also be changed under software control using the ADCLPOL
register bit.
The oversampling rate of the ADC can be adjusted using the ADCOSR register bit.
With ADCOSR=0 the oversample rate is 64x which gives lowest power operation and when
ADCOSR=1 the oversample rate is 128x which gives best performance.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
ADCLPOL
0
ADC channel polarity adjust:
0=normal
1=inverted
R14
ADC Control
3
ADCOSR128
0
ADC oversample rate select:
0=64x (lower power)
1=128x (best performance)
Table 14 ADC Control
SELECTABLE HIGH PASS FILTER
A selectable high pass filter is provided. To disable this filter set HPFEN=0. The filter has two
modes controlled by HPFAPP. In Audio Mode (HPFAPP=0) the filter is first order, with a cut-off
frequency of 3.7Hz. In Application Mode (HPFAPP=1) the filter is second order, with a cut-off
frequency selectable via the HPFCUT register. The cut-off frequencies when HPFAPP=1 are shown
in Table 16.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8
HPFEN
1
High Pass Filter Enable
0=disabled
1=enabled
7
HPFAPP
0
Select audio mode or application mode
0=Audio mode (1
st order, fc = ~3.7Hz)
1=Application mode (2
nd order, fc =
HPFCUT)
R14
ADC Control
6:4
HPFCUT
000
Application mode cut-off frequency
See Table 16 for details.
Table 15 ADC Enable Control
FS (KHZ)
SR=101/100
SR=011/010
SR=001/000
HPFCUT
8
11.025
12
16
22.05
24
32
44.1
48
000
82
113
122
82
113
122
82
113
122
001
102
141
153
102
141
153
102
141
153
010
131
180
156
131
180
156
131
180
156
011
163
225
245
163
225
245
163
225
245
100
204
281
306
204
281
306
204
281
306
101
261
360
392
261
360
392
261
360
392
110
327
450
490
327
450
490
327
450
490
111
408
563
612
408
563
612
408
563
612
Table 16 High Pass Filter Cut-off Frequencies (HPFAPP=1)
Note that the High Pass filter values (when HPFAPP=1) work on the basis that the SR register bits
are set correctly for the actual sample rate as shown in Table 16.



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