STA381BWS datasheet(126/174 Pages) STMICROELECTRONICS

126 / 174 page

STA381BWS

126/174

DocID018937 Rev 7

7.7.2

Master volume register

7.7.3

Channel 1 volume

7.7.4

Channel 2 volume

7.7.5

Channel 3 / line output volume

The volume structure of the STA381BWS consists of individual volume registers for each

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

setting. The individual channel volumes are adjustable in 0.5 dB steps from +48 dB to

-80 dB.

As an example if CH3VOL = 0x00 or +48 dB and MVOL = 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

mute (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

R/W

C1M

Channel 1 mute

0 - No mute condition. It is possible to set the channel

volume

1 - Channel 1 in hardware mute

R/W

MMUTE

Master mute

0 - Normal operation

1 - All channels are in mute condition

Bit

R/W

RST

Name

Description

MVOL[7:0]

11111111

CH1VOL[7:0]

01100000

CH2VOL[7:0]

01100000

CH3VOL[7:0]

01100000

Obsolete

Product(s)

- Obsolete

Product(s)

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