STA308 STMicroelectronics, STA308 Datasheet - Page 19

• Manufacturer Part Number: STA308
• Description: IC AUDIO PROCESSOR DGTL 64-TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA308

• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -

3.14 Channel 6 Volume (address 0Eh)
3.15 Channel 7 Volume (address 0Fh)
3.16 Channel 8 Volume (address 10h)
The Volume structure of the STA308 consists of individual volume registers for each channel and a master vol-
ume register that provides an offset to each channels volume setting. The individual channel volumes are ad-
justable in 0.5dB steps from +24dB to -103dB. As an example if C5V = 0Bh or +18.5dB and MV = 21h or -
16.5dB, then the total gain for channel 5 = +2dB. 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 8192 samples from the maximum volume
setting at the internal processing rate(~192kHz). A "hard mute" can be obtained by commanding a value of all
1's(255) to any channel volume register or the master volume register. When volume offsets are provided via
the master volume register any channel that whose total volume is less than -103dB will be muted. All changes
in volume take place at zero-crossings when ZCE = 1(configuration register B) on a per channel basis as this
creates the smoothest possible volume transitions. When ZCE=0, volume updates will occur immediately.
Table 5. Master Volume Offset as a function of MV(7..0).
NAME
NAME
NAME
RST
RST
RST
BIT
BIT
BIT
01001100(4Ch)
11111110(FEh)
11111111(FFh)
00000000(00h)
00000001(01h)
00000010(02h)
MV(7..0)
…
…
C6V7
C7V7
C8V7
D7
D7
D7
0
0
0
C6V6
C7V6
C8V6
D6
D6
D6
0
0
0
C6V5
C7V5
C8V5
D5
D5
D5
1
1
1
C6V4
C7V4
C8V4
Volume Offset from Channel Value
D4
D4
D4
1
1
1
Hard Master Mute
C6V3
C7V3
C8V3
D3
D3
D3
0
0
0
-127dB
-0.5dB
-38dB
-1dB
0dB
…
…
C6V2
C7V2
C8V2
D2
D2
D2
0
0
0
C6V1
C7V1
C8V1
D1
D1
D1
0
0
0
STA308
C6V0
C7V0
C8V0
D0
D0
D0
0
0
0
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