STA320 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA320 Datasheet PDF : 37 Pages
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STA320
5.7.5 Master Volume Register
D7
D6
D5
D4
D3
D2
D1
D0
MV7
MV6
MV5
MV4
MV3
MV2
MV1
MV0
1
1
1
1
1
1
1
1
5.7.6 Channel 1 Volume
D7
D6
C1V7
0
C1V6
1
D5
C1V5
1
D4
C1V4
0
D3
C1V3
0
D2
C1V2
0
D1
C1V1
0
D0
C1V0
0
5.7.7 Channel 2 Volume
D7
D6
C2V7
C2V6
0
1
D5
C2V5
1
D4
C2V4
0
D3
C2V3
0
D2
C2V2
0
D1
C2V1
0
D0
C2V0
0
5.7.8 Channel 3 Volume
D7
D6
D5
D4
D3
D2
D1
D0
C3V7
C3V6
C3V5
C3V4
C3V3
C3V2
C3V1
C3V0
0
1
1
0
0
0
0
0
The Volume structure of the STA320 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 0.5dB steps from +48dB to -80 dB.
As an example if C3V = 00h or +48dB and MV = 18h or -12dB, then the total gain for channel 3 = +36dB.
The Master Mute when set to 1 will mute all channels at once, whereas the individual channel mutes(CxM)
will mute 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(~96kHz). A "hard mute"
can be obtained by commanding a value of all 1's(255) to any channel volume register or the master vol-
ume register. When volume offsets are provided via the master volume register any channel that whose
total volume is less than -80dB will be muted.
All changes in volume take place at zero-crossings when ZCE = 1(configuration register F) on a per chan-
nel basis as this creates the smoothest possible volume transitions. When ZCE=0, volume updates will
occur immediately.
Table 16. Master Volume Offset as a function of MV(7..0).
MV(7..0)
00000000(00h)
00000001(01h)
00000010(02h)
…
01001100(4Ch)
…
11111110(FEh)
11111111(FFh)
Volume Offset from Channel Value
0dB
-0.5dB
-1dB
…
-38dB
…
-127dB
Hard Master Mute
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