WM8978_06 Datasheet, PDF (100/119 Pages) Wolfson Microelectronics plc – Stereo CODEC With Speaker Driver

WM8978
REGISTER BIT
ADDRESS
LABEL
4:0 EQ5G
24 (18h)
8
LIMEN
7:4 LIMDCY
3:0 LIMATK
25 (19h)
8:7
6:4 LIMLVL
3:0 LIMBOOST
w
DEFAULT
DESCRIPTION
Pre-Production
REFER TO
01100
0
0011
0010
00
000
0000
EQ Band 5 Gain Control. See Table 39 for
details.
Enable the DAC digital limiter:
0=disabled
1=enabled
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
DAC Limiter Attack time (per 6dB gain change)
for 44.1kHz sampling. Note that these will scale
with sample rate.
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
Reserved
Programmable signal threshold level
(determines level at which the DAC limiter starts
to operate)
000=-1dB
001=-2dB
010=-3dB
011=-4dB
100=-5dB
101 to 111=-6dB
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
Output Signal
Path
Output Signal
Path
Output Signal
Path
Output Signal
Path
Output Signal
Path
Output Signal
Path
PP Rev 3.0 May 2006
100