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WM8950 Datasheet(PDF) 19 Page - Wolfson Microelectronics plc

Part # WM8950
Description  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
PDF  52 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8950 Datasheet(HTML) 19 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8950
w
PTD Rev 2.1 June 2005
19
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 11.
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 11 for details.
Table 10 ADC Filter Select
SAMPLE FREQUENCY (kHz)
8
11.025
12
16
22.05
24
32
44.1
48
HPFCUT
[2:0]
SR=101/100
SR=011/010
SR=001/000
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 11 High Pass Filter Cut-off Frequencies (HPFAPP=1) Values in Hz
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 11.



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