STA538B datasheet(17/59 Pages) STMICROELECTRONICS

部件名	STA538B

功能描述	2 x 1.3 W class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX

PDF	59 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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17 / 59 page

STA538

Digital processing

17/59

4.3

Volume control and gain

The volume control structure of the STA538 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 (~48 kHz).

Table 12.

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 13.

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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