WM8940GEFL 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8940GEFL

Mono CODEC with Speaker Driver

Wolfson Microelectronics plc 

Pre-Production

REGISTER BIT

ADDRESS

8

LABEL

LIMEN

24 (18h) 7:4 LIMDCY

3:0 LIMATK

25 (19h)

15:7

6:4 LIMLVL

3:0 LIMBOOST

26 (1Ah) 15:0

27 (1Bh) 15:0

DEFAULT

DESCRIPTION

WM8940

REFER TO

0

0011

0010

000h

000

0000

0000h

0000h

Enable the DAC digital limiter:

0=disabled

Output Signal

Path

1=enabled

DAC Limiter Decay time (per 6dB gain change) for

44.1kHz sampling. Note that these will scale with

sample rate:

Output Signal

Path

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

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

Reserved

DAC Limiter Programmable signal threshold level

Output Signal

(determines level at which the limiter starts to operate) Path

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):

Output Signal

Path

0000=0dB

0001=+1dB

0010=+2dB

… (1dB steps)

1011=+11dB

1100=+12dB

1101 to 1111=reserved

Reserved

Reserved

w

Pre-Production, Rev 3.0, February 2007

73

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