BU26156RFS Datasheet, PDF (65/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
High Pass Filter2 Cut-off Control Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0x7e 0x7f
-
-
-
-
-
HPF2CUT
-
-
-
-
-
0
0
0
HPF2CUT[2:0]
This register is to set the cut off frequency of the high pass filter for noise reduction. Do not change this register setting at
filtering operation.
These bits are to set the cut-off frequency of noise reduction high pass filter.
The following table shows that the frequency decreases 3dB at second order filter selected (HPF2OD=0)
and decreases 1.5dB at first order filter selected (HPF2OD=1).
Cut-off Frequency(Hz)
setting
fs=8kHz,
16kHz,
fs=11.025kHz,
22.05kHz,
fs=12kHz,
24kHz,
32kHz
44.1kHz
48kHz
0x0
80
110
120
0x1
100
138
150
0x2
130
179
195
0x3
160
221
240
0x4
200
276
300
0x5
260
358
390
0x6
320
441
480
0x7
400
551
600
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TSZ22111・15・001
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TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001