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WM8953ECS/RV 데이터시트(PDF) 38 Page - Wolfson Microelectronics plc

부품명 WM8953ECS/RV
상세설명  Low Power Stereo ADC with PLL and TDM Interface
PDF  100 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8953ECS/RV 데이터시트(HTML) 38 Page - Wolfson Microelectronics plc

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WM8953
Production Data
w
PD, January 2009, Rev 4.0
38
HIGH PASS FILTER
A digital high pass filter is applied by default to the ADC path to remove DC offsets. This filter can
also be programmed to remove low frequency noise in voice applications (e.g. wind noise or
mechanical vibration). This filter is controlled using the ADC_HPF_ENA and ADC_HPF_CUT register
bits.
In hi-fi mode the high pass filter is optimised for removing DC offsets without degrading the bass
response and has a cut-off frequency of 3.7Hz at fs=44.1kHz.
In voice mode the high pass filter is optimised for voice communication and it is recommended to
program the cut-off frequency below 300Hz (e.g. ADC_HPF_CUT=11 at fs=8kHz or
ADC_HPF_CUT=10 at fs=16kHz).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8
ADC_HPF_ENA
1b
ADC Digital High Pass Filter Enable
0 = disabled
1 = enabled
R14 (0Eh)
6:5
ADC_HPF_CUT
[1:0]
00b
ADC Digital High Pass Filter Cut-Off
Frequency (fc)
00 = Hi-fi mode (fc=4Hz at fs=48kHz)
01 = Voice mode 1 (fc=127Hz at fs=16kHz)
10 = Voice mode 2 (fc=130Hz at fs=8kHz)
11 = Voice mode 3 (fc=267Hz at fs=8kHz)
(Note: fc scales with sample rate. See
Table 16 for cut-off frequencies at all
supported sample rates)
Table 15 ADC High Pass Filter Control Registers
Cut-off frequency (Hz)
Sample
Frequency
(kHz)
ADC_HPF_CUT
=00
ADC_HPF_CUT
=01
ADC_HPF_CUT
=10
ADC_HPF_CUT
=11
8.000
0.7
64
130
267
11.025
0.9
88
178
367
16.000
1.3
127
258
532
22.050
1.9
175
354
733
24.000
2.0
190
386
798
32.000
2.7
253
514
1063
44.100
3.7
348
707
1464
48.000
4.0
379
770
1594
Table 16 ADC High Pass Filter Cut-Off Frequencies
The high pass filter characteristics are shown in the "Digital Filter Characteristics" section.



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