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STA339BWTR View Datasheet(PDF) - STMicroelectronics

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STA339BWTR Datasheet PDF : 78 Pages
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STA339BW
Register description
7.7.4
7.7.5
Channel 2 volume
D7
C2V7
0
D6
C2V6
1
D5
C2V5
1
D4
C2V4
0
Channel 3 / line output volume
D3
C2V3
0
D2
C2V2
0
D1
C2V1
0
D0
C2V0
0
D7
C3V7
0
D6
C3V6
1
D5
C3V5
1
D4
C3V4
0
D3
C3V3
0
D2
C3V2
0
D1
C3V1
0
D0
C3V0
0
The Volume structure of the STA339BW consists of individual volume registers for each
channel and a master volume register that provides an offset to each channels volume
setting. The individual channel volumes are adjustable in 0.5 dB steps from +48 dB to -
80 dB.
As an example if C3V = 0x00 or +48 dB and MV = 0x18 or -12 dB, then the total gain for
channel 3 = +36 dB.
The master mute, when set to 1, mutes all channels at once, whereas the individual channel
mutes (CxM) mutes only that channel. Both the master mute and the channel mutes provide
a “soft mute” with the volume ramping down to mute in 4096 samples from the maximum
volume setting at the internal processing rate (approximately 96 kHz).
A “hard (instantaneous) mute” can be obtained by programming a value of 0xFF (255) to
any channel volume register or the master volume register. When volume offsets are
provided via the master volume register any channel whose total volume is less than -80 dB
is muted.
All changes in volume take place at zero-crossings when ZCE = 1 (Configuration register E
(addr 0x04) on page 37) on a per channel basis as this creates the smoothest possible
volume transitions. When ZCE = 0, volume updates occur immediately.
Table 54. Master volume offset as a function of MV[7:0]
MV[7:0]
Volume offset from channel value
00000000 (0x00)
0 dB
00000001 (0x01)
00000010 (0x02)
-0.5 dB
-1 dB
01001100 (0x4C)
-38 dB
11111110 (0xFE)
-127.5 dB
11111111 (0xFF)
Hard master mute
DocID15251 Rev 7
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