STA335BWSQS datasheet(43/70 Pages) STMICROELECTRONICS

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STA335BWSQS

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6.7.5

Channel 3 and line-output volume

The Volume structure of the STA335BWSQS 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 mutes all channels at once, whereas the individual channel

mutes (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 mute” can be obtained by commanding a value of 0xFF (255) to any channel volume

volume register any channel that whose total volume is less than -80 dB is 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 occur immediately.

C3V7

C3V6

C3V5

C3V4

C3V3

C3V2

C3V1

C3V0

Table 52.

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 53.

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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