BU9408KS2_12 Datasheet, PDF (36/57 Pages) Rohm – 32bit Audio DSP with Built-in 4ch DAC and ASRC

BU9408KS2
Technical Note
4-15. Main output EVR (Electronic volume)
Volume is from+24dB to -103dB, and can be selected by the step of 0.5dB.
At the time of switching of Volume, smooth transition is performed.
The expression in the transition time from x[dB] to y[dB] is |(10^(x/20)-10^(y/20)|*21.4ms (Main output balance
Lch=Rch=0dB). The transition time is 21.4ms when it is from 0dB to -∞. Recommend that this setting value is 0dB and under.
Setting of Volume
Default = FFh
Select Address
&h26 [ 7:0 ]
Operational explanation
Command
00
01
Gain
+24dB
+23.5dB
30
0dB
31
-0.5dB
32
-1dB
FE
-103dB
FF
-∞
4-16. Main output balance
Balance can be attenuated, by the step width of 1dB, from the Volume setting value. At the time of switching, smooth
transition is performed. At the time of switching of Balance, smooth transition is performed.
The expression in the transition time from x[dB] to y[dB] is |(10^((Volume+x)/20)-10^((Volume+y)/20)|*21.4ms.
Setting of L/R Balance
Default = 80h
Select Address
&h27 [ 7:0 ]
Operational explanation
Command
00
01
Lch
Rch
0dB
-∞
0dB -126dB
7E
0dB -1dB
7F
0dB
0dB
80
0dB
0dB
81
-1dB 0dB
FE
-126dB 0dB
FF
-∞
0dB
4-17. Main output postscaler
It performs the level adjustment when the data calculated in the 32-bit-width DSP is outputted in the form of 24bitwidth.
Adjustable range is from +24dB to -103dB and can be set by the step of 0.5dB.
There is no smooth transition function in Postscaler.
Default = 30h
Select Address
&h28 [ 7:0 ]
Operational explanation
Command
00
01
Gain
+24dB
+23.5dB
30
0dB
31
-0.5dB
32
-1dB
FE
-103dB
FF
-∞
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2012.03 - Rev.A