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STA350B Datasheet(PDF) 81 Page - STMicroelectronics

Part # STA350B
Description  2.1-channel high-efficiency digital audio system Sound TerminalR
PDF  94 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA350B Datasheet(HTML) 81 Page - STMicroelectronics

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DocID018572 Rev 7
81/94
STA350B, STA350BW
Register description
94
Signal level detection in DRC algorithm is computed using the following formula:
y(t) = c0 * abs(x(t)) + c1 * y(t-1)
where x(t) represents the audio signal applied to the limiter, and y(t) the measured level.
8.21
Extra volume resolution configuration registers (address
0x3F)
The extra volume resolution allows fine volume tuning by steps of 0.125dB.
The feature is enabled when VRESEN=1 , as depicted in Figure 34. The overall channel
volume in this case will be CxVol+CxVR (in dB). On top of the total volume range from
-80 dB to +48 dB, this extra volume resolution works in a volume range from -80 dB to +42
dB. For volumes greater than +42 dB, this function must not be selected.
Figure 34. Extra resolution volume scheme
If VRESEN = 0 the channel volume is defined only by the CxVol registers.
Fine-tuning steps can be set according to the following table for channels 1, 2, 3:
D7
D6
D5
D4
D3
D2
D1
D0
R_C1[7]
R_C1[6]
R_C1[5]
R_C1[4]
R_C1[3]
R_C1[2]
R_C1[1]
R_C1[0]
0010
0110
D7
D6
D5
D4
D3
D2
D1
D0
VRESEN
VRESTG
C3VR[1]
C3VR[0]
C2VR[1]
C2VR[0]
C1VR[1]
C1VR[0]
0
0
00
00
0
0
Audio Data Out
CxVOL
Soft
Volume
X
X
Audio Data In
VRESEN
VRESTG
CxVR
MVOL or CxVOL’event
1
0
0
1
Audio Data Out
CxVOL
Soft
Volume
X
X
Audio Data In
VRESEN
VRESTG
CxVR
MVOL or CxVOL’event
1
0
0
1
AM045196v1



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