STA529 datasheet(19/57 Pages) STMICROELECTRONICS

Part #	STA529

Description	FFX™ audio codec with analog and digital inputs and 2 x 1.2 W (or 2 x 100 mW HP) class-D amplifier

PDF	57 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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19 / 57 page

STA529

Digital processing

Doc ID 13095 Rev 3

19/57

5.3

Volume control and gain

The volume control structure of the STA529 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 +36 dB

to -91.5 dB. As an example, if register LVOL = 0x00 or +36 dB and register MVOL = 0x18

or -12 dB, then the total gain for the left channel is +24 dB.

When the mute bit is set to 1, all channels are muted. The volume control provides a soft

mute with the volume ramping down to mute in 4096 samples from the maximum volume

setting at the internal processing rate (around 48 kHz).

Table 13.

Master volume offset as a function of register MVOL

MVOL[7:0]

Volume offset from channel value

0x00

0 dB

0x01

-0.5 dB

0x02

-1dB

……

0x78

-60 dB

……

0xFE

-105 dB

0xFF

Hard master mute

Table 14.

Channel volume as a function of registers LVOL and RVOL

LVOL/RVOL[7:0]

Volume

0x00

+36 dB

0x01

+35.5 dB

0x02

+35 dB

……

0x47

+0.5 dB

0x48

0dB

0x49

-0.5 dB

……

0xFF

-91.5 dB

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