WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 89

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WM8978

Manufacturer Part Number
WM8978
Description
The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet

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Preliminary Technical Data
w
24 (18h)
25 (19h)
REGISTER
ADDRESS
4:0
8
7:4
3:0
8:7
6:4
3:0
BIT
EQ5G
LIMEN
LIMDCY
LIMATK
LIMLVL
LIMBOOST
LABEL
01100
0
0011
0010
00
000
0000
DEFAULT
EQ Band 5 Gain Control. See Table 32 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
DESCRIPTION
PTD Rev 2.6 November 2005
Output Signal
Path
Output Signal
Path
Output Signal
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Output Signal
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Output Signal
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Output Signal
Path
REFER TO
WM8978
89