WM8940 datasheet(73/85 Pages) WOLFSON

73 / 85 page

Pre-Production

WM8940

Pre-Production, Rev 3.0, February 2007

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

LIMEN

Enable the DAC digital limiter:

0=disabled

1=enabled

Output Signal

Path

7:4

LIMDCY

0011

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

Output Signal

Path

24 (18h)

3:0

LIMATK

0010

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

Output Signal

Path

15:7

000h

Reserved

6:4

LIMLVL

000

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

Output Signal

Path

25 (19h)

3:0

LIMBOOST

0000

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

26 (1Ah)

15:0

0000h

Reserved

27 (1Bh)

15:0

0000h

Reserved

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