STA538 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA538' PDF : 59 Pages View PDF
STA538
Digital processing
4.3
Volume control and gain
The volume control structure of the STA538 consists of individual volume registers for each
channel and a master volume register that provides an offset to each channel’s volume
setting. The individual channel volumes are adjustable in 0.5 dB steps from +36 dB to
-91.5 dB. As an example, if register LVOL = 0x00 or +36 dB and register MVOL = 0x18 or
-12 dB, then the total gain for the left channel is +24 dB.
When the mute bit is set to 1, all channels are muted. The volume control provides a soft
mute with the volume ramping down to mute in 4096 samples from the maximum volume
setting at the internal processing rate (~48 kHz).
Table 12. Master volume offset as a function of register MVOL
MVOL[7:0]
Volume offset from channel value
0x00
0x01
0x02
…
0x78
…
0xFE
0xFF
0 dB
-0.5 dB
-1dB
…
-60 dB
…
-105 dB
Hard master mute
Table 13. Channel volume as a function of registers LVOL and RVOL
LVOL/RVOL[7:0]
Volume
0x00
+36 dB
0x01
+35.5 dB
0x02
+35 dB
…
0x47
…
+0.5 dB
0x48
0 dB
0x49
-0.5 dB
…
…
…
…
0xFF
-91.5 dB
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