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STA529 bảng dữ liệu(PDF) 19 Page - STMicroelectronics

tên linh kiện STA529
Giải thích chi tiết về linh kiện  FFX™ audio codec with analog and digital inputs and 2 x 1.2 W (or 2 x 100 mW HP) class-D amplifier
PDF  57 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STA529 bảng dữ liệu(HTML) 19 Page - STMicroelectronics

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STA529
Digital processing
Doc ID 13095 Rev 3
19/57
5.3
Volume control and gain
The volume control structure of the STA529 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 (around 48 kHz).
Table 13.
Master volume offset as a function of register MVOL
MVOL[7:0]
Volume offset from channel value
0x00
0 dB
0x01
-0.5 dB
0x02
-1dB
……
0x78
-60 dB
……
0xFE
-105 dB
0xFF
Hard master mute
Table 14.
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
0dB
0x49
-0.5 dB
……
……
0xFF
-91.5 dB



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