STA382BWSTR datasheet(125/172 Pages) STMICROELECTRONICS

125 / 172 page

STA382BWS

Doc ID 022784 Rev 1

125/172

As an example if CH3VOL = 0x00 or +48 dB and MVOL = 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

mute (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 (instantaneous) mute” can be obtained by programming a value of 0xFF (255) to

any channel volume register or the master volume register. When volume offsets are

provided via the master volume register, any channel whose total volume is less than -80 dB

is muted.

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

(addr 0x04)) on a per-channel basis as this creates the smoothest possible volume

transitions. When ZCE = 0, volume updates occur immediately.

Table 135.

Master volume offset as a function of MVOL[7:0]

MVOL[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 136.

Channel volume as a function of CxVOL[7:0]

CxVOL[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

……

11010111 (0xD7)

-59.5 dB

11011000 (0xD8)

-60 dB

11011001 (0xD9)

-61 dB

11011010 (0xDA)

-62 dB

……

11101100 (0xEC)

-80 dB

11101101 (0xED)

Hard channel mute

……

11111111 (0xFF)

Hard channel mute

Obsolete

Product(s)

- Obsolete

Product(s)

STA382BWSTR 数据表(PDF) 125 Page - STMicroelectronics

STA382BWSTR 数据表(HTML) 125 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载