BM28723AMUV
14 Digital Sound Processing (DSP) - continued
14.5 Volume Setting
Volume is from +24dB to -103dB, and can be selected by the step of 0.125dB. And it is also possible to be set to -infinity
dB. L/R independent or L/R dependent can be selected by 0x10[7]. At the time of switching of Volume, soft transition is
executed. Soft transition duration is optional with the command.
It becomes the following formula at the transition from AdB to BdB. C is soft transition duration selected by 0x15[7:6]
command.
A
B
20
20
10 10
C
Transition time =
[ms]
Setting of soft transition time
Default=0x0
Select Address
Value
0x0
Explanation of Operation
0x15[7:6]
21.3ms
42.7ms
85.3ms
Don't use
0x1
0x2
0x3
Lch/dependent volume setting
Default=0xFF
Select Address
0x11[7:0]
Explanation of Operation
Value
0x00
0x01
Gain
+24dB
+23.5dB
0x30
0x31
0x32
0dB
-0.5dB
-1dB
0xFE
0xFF
-103dB
-∞
Fine volume setting function becomes effective by sending the following command.
When using this command, it is possible to set a volume in 0.125dB step.
When L/R dependent volume setting, 0x11[7:0] is enable.
When L/R independent volume setting, 0x11[7:0] is the volume setting of Lch.
Lch/dependent fine volume setting
It is possible to use with the 0.5dB step in changing only 0x11[7:0] when 0x10[1:0]=0x0.
Default=0x0
Select Address
0x10[1:0]
Value
0x0
Explanation of Operation
0dB
0x1
0x2
0x3
-0.125dB
-0.25dB
-0.375dB
www.rohm.com
TSZ02201-0C1C0E900720-1-2
31.Aug.2018 Rev.001
© 2018 ROHM Co., Ltd. All rights reserved.
41/79
TSZ22111 • 15 • 001
ROHM [ ROHM ]
