BU26156RFS Datasheet, PDF (73/95 Pages) Rohm – Monoraul MIC Input with ALC

BU26156RFS
Datasheet
Playback ALC Decay Time Control Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0xde 0xdf
-
-
-
-
PALCDCY
-
-
-
-
0
1
0
1
This register is to set the decay time that is the step period for the playback ALC volume up.
PALCDCY[3:0]
These bits are to set the playback ALC decay time. The playback ALC volume ups step by step per this decay time period.
Decay time is in proportion to sampling frequency(fs) as following table.
setting
fs equivalent
Time(fs=48kHz)
0x0
4/fs
83.3us
0x1
8/fs
0x2
16/fs
167us
333us
0x3
32/fs
0x4
64/fs
667us
1.33ms
0x5
128/fs
2.67ms
0x6
256/fs
0x7
512/fs
5.33ms
10.7ms
0x8
1024/fs
0x9
2048/fs
21.3ms
42.7ms
0xA
4096/fs
0xB
8192/fs
85.3ms
171ms
0xC
16384/fs
0xD
32768/fs
341ms
683ms
0xE
65536/fs
1.37s
0xF
131072/fs
2.73s
Playback ALC Target Level Control Register
MAPCON
INDEX
b07
b06
b05
b04
b03
b02
b01
b00
R
W
(Initial)
0x0
0xe0 0xe1
-
-
-
PALCLVL
-
-
-
1
1
0
1
1
This register is to set the target level of the playback ALC.
PALCLVL[4:0]
These bits are to set the target level of the playback ALC.
setting
Target Level
(dBFS)
setting
0x00
-23.25
0x10
0x01
-22.50
0x11
0x02
-21.75
0x12
0x03
-21.00
0x13
0x04
-20.25
0x14
0x05
-19.50
0x15
0x06
-18.75
0x16
0x07
-18.00
0x17
0x08
-17.25
0x18
0x09
-16.50
0x19
0x0A
-15.75
0x1A
0x0B
-15.00
0x1B
0x0C
-14.25
0x1C
0x0D
-13.50
0x1D
0x0E
-12.75
0x0F
-12.00
Target Level
(dBFS)
-11.25
-10.50
-9.75
-9.00
-8.25
-7.50
-6.75
-6.00
-5.25
-4.50
-3.75
-3.00
-2.25
-1.50
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TSZ22111・15・001
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TSZ02201-0V1V0E502570-1-2
Jul.1.2014 Rev.001