WM8758B datasheet(46/90 Pages) WOLFSON

46 / 90 page

WM8758B

Production Data

PD, Rev 4.4, January 2012

VOLUME BOOST

The limiter has programmable upper gain which boosts signals below the threshold to compress the

dynamic range of the signal and increase its perceived loudness. This operates as an ALC function

with limited boost capability. The volume boost is from 0dB to +12dB in 1dB steps, controlled by the

LIMBOOST register bits.

The output limiter volume boost can also be used as a stand alone digital gain boost when the limiter

is disabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24

DAC digital

limiter control

3:0

LIMATK

0010

Limiter Attack time (per 6dB gain

change) for 44.1kHz sampling. Note

that these are proportionally related to

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

7:4

LIMDCY

0011

Limiter Decay time (per 6dB gain

change) for 44.1kHz sampling. Note

that these are proportionally related to

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

LIMEN

Enable the DAC digital limiter:

0=disabled

1=enabled

R25

DAC digital

limiter control

3:0

LIMBOOST

0000

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

WM8758B Datasheet(PDF) 46 Page - Wolfson Microelectronics plc

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