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WM8944BECS/R 데이터시트(PDF) 30 Page - Cirrus Logic

부품명 WM8944BECS/R
상세설명  Mono Low-Power CODEC with Video Buffer
PDF  165 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8944BECS/R 데이터시트(HTML) 30 Page - Cirrus Logic

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WM8944B
30
Rev 4.3
ADC HIGH PASS FILTER
A digital high-pass filter is enabled by default to the ADC path to remove DC offsets. This filter can
also be used to remove low frequency noise in handheld applications (e.g. wind noise, handling noise
or mechanical vibration).
The ADC High Pass filter is enabled by ADC_HPF. Note that this filter must always be set when the
Dynamic Range Controller (DRC) is enabled. The DRC will not function correctly if ADC_HPF is not
set.
The filter operates in one of two modes, selected by ADC_HPF_MODE.
The ADC_HPF_SR register should b
e set according to the selected ADC sample rate. See “Clocking
and Sample Rates
” for details of the ADC sample rate.
In Hi-Fi mode (ADC_HPF_MODE = 0), the high-pass filter is optimised for removing DC offsets
without degrading the bass response and has a cut-off frequency of 3.5Hz when the sample rate (fs) =
44.1kHz.
In Application mode (ADC_HPF_MODE = 1), the HPF cut-off frequency is set using ADC_HPF_CUT.
This mode is intended for voice communication; it is recommended to set the cut-off frequency below
300Hz (e.g. ADC_HPF_CUT = 101 when fs = 8kHz or fs = 16kHz).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R26 (1Ah)
ADC Control 2
6
ADC_HPF_MOD
E
0
ADC Digital HPF Mode
0 = Hi-Fi mode (1st order)
1 = Application mode (2nd order)
5:4
ADC_HPF_SR
[1:0]
10
ADC Digital HPF Sample Rate
00 = 8kHz to 12kHz
01 = 16kHz to 24kHz
10 = 32kHz to 48kHz
11 = Reserved
3:1
ADC_HPF_CUT
[2:0]
000
ADC Digital High Pass Filter Cutoff
Note that the cut-off frequency
scales with sample rate. See Table
11 for cut-off frequencies at all
supported sample rates.
0
ADC_HPF
1
ADC Digital High Pass Filter Enable
0 = Disabled
1 = Enabled
Table 10 ADC High-pass Filter Control Registers
SAMPLE
FREQUENCY
(kHz)
CUT-OFF FREQUENCY (Hz)
HI-FI
MODE
APPLICATION MODE / ADC_HPF_CUT[2:0]
000
001
010
011
100
101
110
111
8.000
3.0
80.5
100.5
129.0
160.5
200.5
256.5
320.5
400.5
11.025
4.5
111.0
138.5
177.5
221.0
276.5
353.0
442.0
551.5
12.000
4.5
120.5
151.0
193.0
240.5
300.5
384.5
481.0
600.5
16.000
3.0
80.0
101.0
129.0
161.0
200.5
256.5
321.0
401.0
22.050
4.5
110.5
139.0
177.5
221.5
276.0
353.5
442.0
552.5
24.000
4.5
120.5
151.5
193.5
241.5
300.5
385.0
481.5
601.0
32.000
2.5
80.0
101.5
129.0
160.5
200.0
257.5
320.0
401.0
44.100
3.5
110.0
139.5
177.5
221.0
275.5
355.0
441.0
552.5
48.000
4.0
119.5
152.0
193.0
240.5
300.0
386.5
480.0
601.0
Table 11 ADC High-pass Filter Cut-off Frequencies
Filter response plots for the ADC high-pass
filter are shown in “Digital Filter Characteristics”.



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