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WM8976 датащи(PDF) 92 Page - Wolfson Microelectronics plc

номер детали WM8976
подробное описание детали  Stereo CODEC With Speaker Driver
PDF  108 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 датащи(HTML) 92 Page - Wolfson Microelectronics plc

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WM8976
Pre-Production
w
PP Rev 3.0 April 2006
92
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
8
ALCSEL
0
ALC function select:
0=ALC off
1=ALC on
Input Limiter/
Automatic
Level Control
(ALC)
7:6
00
Reserved
5:3
ALCMAXGAIN
111
Set Maximum Gain of PGA
111=+35.25dB
110=+29.25dB
101=+23.25dB
100=+17.25dB
011=+11.25dB
010=+5.25dB
001=-0.75dB
000=-6.75dB
Input Limiter/
Automatic
Level Control
(ALC)
32 (20h)
2:0
ALCMINGAIN
000
Set minimum gain of PGA
000=-12dB
001=-6dB
010=0dB
011=+6dB
100=+12dB
101=+18dB
110=+24dB
111=+30dB
Input Limiter/
Automatic
Level Control
(ALC)
7:4
ALCHLD
0000
ALC hold time before gain is increased.
0000 = 0ms
0001 = 2.67ms
0010 = 5.33ms
… (time doubles with every step)
1111 = 43.691s
Input Limiter/
Automatic
Level Control
(ALC)
33 (21h)f
3:0
ALCLVL
1011
ALC target – sets signal level at ADC input
1111 : -1.5dBFS
1110 : -1.5dBFS
1101 : -3dBFS
1100 : -4.5dBFS
...... (-1.5dB steps)
0001 : -21dBFS
0000 : -22.5dBFS
Input Limiter/
Automatic
Level Control
(ALC)
8
ALCMODE
0
Determines the ALC mode of operation:
0=ALC mode
1=Limiter mode
Input Limiter/
Automatic
Level Control
(ALC)
Decay (gain ramp-up) time
(ALCMODE ==0)
Per step
Per 6dB
90% of
range
0000
410us
3.3ms
24ms
0001
820us
6.6ms
48ms
0010
1.64ms
13.1ms
192ms
… (time doubles with every step)
0011
1010 or
higher
420ms
3.36s
24.576s
Decay (gain ramp-up) time
(ALCMODE ==1)
Per step
Per 6dB
90% of
range
34 (22h)
7:4
ALCDCY
[3:0]
0011
0000
90.8us
726.4us
5.26ms
Input Limiter/
Automatic
Level Control
(ALC)



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