STA326 datasheet(37/64 Pages) STMICROELECTRONICS

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STA326

the master volume register. When volume offsets are provided via the master volume

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 will occur immediately.

The STA326 also features a soft-volume update function that will ramp the volume between

intermediate values when the value is updated, when SVE = 1 (configuration register E).

This 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 will not affect that

channel. Also, master soft-mute will 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 46. 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 47. Channel volume as a function of CxV[7:0]

CxV[7:0]

Volume

00000000 (0x00)

+48 dB

00000001 (0x01)

+47.5 dB

00000010 (0x02)

+47dB

……

01100001 (0x5F)

+0.5 dB

01100000 (0x60)

0 dB

01011111 (0x61)

-0.5 dB

……

11111110 (0xFE)

-79.5 dB

11111111 (0xFF)

Hard channel mute

Obsolete

Product(s)

- Obsolete

Product(s)

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