STA323W datasheet(51/77 Pages) STMICROELECTRONICS

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STA323W

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When set to 1, the Master Mute will mute all channels, whereas the individual channel

mutes (CxM) will mute only that channel. Both the Master Mute and the Channel Mutes

provide a “soft mute”, that is, a gradual muting with the volume ramping down to mute in

4096 samples from the maximum volume setting at the internal processing rate of circa

96 kHz. A “hard mute” can be obtained by setting a value of 0xFF in any channel volume

volume register, any channel whose total volume is less than -100 dB is muted.

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

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

ZCE = 0, volume updates occur immediately.

The STA323W also features a soft-volume update function. When SVE = 1 (in configuration

feature can be disabled by setting SVE = 0.

Each channel also contains an individual channel volume bypass. If a particular channel has

volume bypassed via the CxVBP = 1 register then only the channel volume setting for that

particular channel affects the volume setting, the master volume setting does not affect that

channel. Also, master soft-mute does not affect the channel if CxVBP = 1.

Each channel also contains a channel mute. If CxM = 1 a soft mute is performed on that

channel.

Table 50.

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 dB

11111111 (0xFF)

Hard Master Mute

Table 51.

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

……

01100001 (0x5F)

+0.5 dB

01100000 (0x60)

0 dB

01011111 (0x61)

-0.5 dB

……

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