Pre-Production
WM8940
REGISTER
ADDRESS
BIT
LABEL
LIMEN
DEFAULT
DESCRIPTION
Enable the DAC digital limiter:
REFER TO
8
0
Output Signal
Path
0=disabled
1=enabled
24 (18h)
7:4
LIMDCY
0011
Output Signal
Path
DAC Limiter Decay time (per 6dB gain change) for
44.1kHz sampling. Note that these will scale with
sample rate:
0000=750us
0001=1.5ms
0010=3ms
0011=6ms
0100=12ms
0101=24ms
0110=48ms
0111=96ms
1000=192ms
1001=384ms
1010=768ms
1011 to 1111=1.536s
3:0
LIMATK
0010
DAC Limiter Attack time (per 6dB gain change) for
44.1kHz sampling. Note that these will scale with
sample rate.
Output Signal
Path
0000=94us
0001=188s
0010=375us
0011=750us
0100=1.5ms
0101=3ms
0110=6ms
0111=12ms
1000=24ms
1001=48ms
1010=96ms
1011 to 1111=192ms
25 (19h)
15:7
6:4
000h
000
Reserved
LIMLVL
Output Signal
Path
DAC Limiter Programmable signal threshold level
(determines level at which the limiter starts to operate)
000=-1dB
001=-2dB
010=-3dB
011=-4dB
100=-5dB
101 to 111=-6dB
3:0
LIMBOOST
0000
Output Signal
Path
DAC Limiter volume boost (can be used as a stand
alone volume boost when LIMEN=0):
0000=0dB
0001=+1dB
0010=+2dB
… (1dB steps)
1011=+11dB
1100=+12dB
1101 to 1111=reserved
26 (1Ah)
27 (1Bh)
15:0
15:0
0000h
0000h
Reserved
Reserved
Pre-Production, Rev 3.0, February 2007
73
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
