STA309A datasheet(36/67 Pages) STMICROELECTRONICS

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Registers

STA309A

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Doc ID 13855 Rev 4

7.2.23

Channel 4 volume trim, mute, bypass (0x16)

7.2.24

Channel 5 volume trim, mute, bypass (0x17)

7.2.25

Channel 6 volume trim, mute, bypass (0x18)

7.2.26

Channel 7 volume trim, mute, bypass (0x19)

7.2.27

Channel 8 volume trim, mute, bypass (0x1A)

The volume structure of the STA309A consists of individual volume registers for each

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

setting. There is also an additional offset for each channel called the 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 that whose total volume is less than -91 dB will

be muted. All changes in volume take place at zero-crossings when ZCE = 1 (configuration

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

C4M

C4VBP

Reserved

C4VT4

C4VT3

C4VT2

C4VT1

C4VT0

000

C5M

C5VBP

Reserved

C5VT4

C5VT3

C5VT2

C5VT1

C5VT0

000

C6M

C6VBP

Reserved

C6VT4

C6VT3

C6VT2

C6VT1

C6VT0

000

C7M

C7VBP

Reserved

C7VT4

C7VT3

C7VT2

C7VT1

C7VT0

000

C8M

C8VBP

Reserved

C8VT4

C8VT3

C8VT2

C8VT1

C8VT0

000

STA309A Datasheet(PDF) 36 Page - STMicroelectronics

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