STA333W datasheet(31/42 Pages) STMICROELECTRONICS

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STA333W

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7.2.4

Channel 2 volume

The volume structure of the STA333W 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 0.5 dB steps from +48 dB to

- 80 dB. As an example if C3V = 0x00 or + 48 dB and MV = 0x18 or – 12 dB, then the total

gain for channel 3 = + 36 dB.

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(~96 kHz). 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 – 80 dB will be muted.

All changes in volume take place at zero-crossings when ZCE = 1 (configuration register F)

on a per channel basis as this creates the smoothest possible volume transitions. When

ZCE = 0, volume updates will occur immediately.

C2V7

C2V6

C2V5

C2V4

C2V3

C2V2

C2V1

C2V0

Table 42.

Master volume offset as a function of MV[7:0]

MV(7..0)

Volume offset from channel value

00000000 (0x00)

0 dB

00000001 (0x01)

-0.5 dB

00000010 (0x02)

-1 dB

……

01001100 (0x4C)

-38 dB

……

11111110 (0xFE)

-127.5 dB

11111111 (0xFF)

Hard master mute

Table 43.

Channel volume as a function of CxV[7:0]

CxV[7:0]

Volume

00000000 (0x00)

+48 dB

00000001 (0x01)

+47.5 dB

00000010 (0x02)

+47 dB

……

01011111 (0x5F)

+0.5 dB

01100000 (0x60)

0 dB

01100001 (0x61)

-0.5 dB

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