wm8941 Wolfson Microelectronics plc, wm8941 Datasheet - Page 25

• Manufacturer Part Number: wm8941
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Production Data
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Table 11 ADC Enable
Table 12 ADC Polarity
SELECTABLE HIGH PASS FILTER
Table 13 ADC Filter Select
The ADC is enabled by the ADCEN register bit.
The polarity of the output signal can also be changed under software control using the ADCPOL
register bit.
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 14.
R2
Power
management 2
R14
ADC Control
R14
ADC Control
REGISTER
ADDRESS
REGISTER
REGISTER
ADDRESS
ADDRESS
8
7
6:4
0
0
BIT
BIT
BIT
ADCEN
ADCPOL
HPFEN
HPFAPP
HPFCUT
LABEL
LABEL
LABEL
0
DEFAULT
1
0
000
DEFAULT
0
DEFAULT
0 = ADC disabled
1 = ADC enabled
High Pass Filter Enable
0=disabled
1=enabled
Select audio mode or application mode
0=Audio mode (1
1=Application mode (2
HPFCUT)
Application mode cut-off frequency
See Table 14 for details.
0=normal
1=inverted
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, Rev 4.0, August 2008
st
order, fc = ~3.7Hz)
nd
order, fc =
WM8941
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