STA311B datasheet(46/102 Pages) STMICROELECTRONICS

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Registers

STA311B

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DocID024340 Rev 1

The volume structure of the STA311B consists of individual volume registers for each

channel and a master volume register that provides an offset to each channel’s volume

setting. There is also an additional offset for each channel called channel volume trim. The

individual channel volumes are adjustable in 0.5 dB steps from +48 dB to -78 dB. As an

example if C5V = 0xXX or +XXX dB and MV = 0xXX or -XX dB, then the total gain for

channel 5 = XX dB. The channel volume trim is adjustable independently on each channel

from -10 dB to +10 dB in 1 dB steps.

The master mute when set to 1 will mute all channels at once, whereas the individual

channel mutes (CnM) 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 (~192 kHz). A "hard mute" can

be obtained by commanding 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 -91 dB will be muted. All changes in volume

take place at zero-crossings when ZCE = 1 (configuration register H) on a per-channel basis

as this creates the smoothest possible volume transitions. When ZCE = 0, volume updates

occur immediately. Each channel also contains an individual channel volume bypass. If a

particular channel has volume bypassed via the CnVBP = 1 register, then only the channel

volume setting for that particular channel affects the volume setting, the master volume

setting will not affect that channel. Each channel also contains a channel mute. If CnM = 1 a

soft mute is performed on that channel.

MV[7:0]

Volume offset from channel value

0x00

0 dB

0x01

-0.5 dB

0x02

-1 dB

……

0x4C

-38 dB

……

0xFE

-127 dB

0xFF

Hardware channel mute

CnV[7:0]

Volume

0x00

+48 dB

0x01

+47.5 dB

0x02

+47 dB

……

0x5F

+0.5 dB

0x60

0 dB

0x61

-0.5 dB

……

0xFE

-79.5 dB

0xFF

Hardware channel mute

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