WM8778SEDSSLASHR datasheet(43/50 Pages) WOLFSON

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Production Data

WM8778

PD Rev 4.0 April 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ALC/Limiter Attack (gain ramp-down) Time

3:0

ATK[3:0]

0010

(33ms/1ms)

ALC Mode

0000: 8.4ms

0001: 16.8ms

0010: 33.6ms…

(time doubles with every step)

1010 or higher: 8.6s

Limiter Mode

0000: 250us

0001: 500us…

0010: 1ms

(time doubles with every step)

1010 or higher: 256ms

ALC/Limiter Decay (gain ramp up) Time

7:4

DCY[3:0]

0011

(268ms/

9.6ms)

ALC Mode

0000: 33.5ms

0001: 67.2ms

0010: 134.4ms ….(time

doubles for every step)

1010 or higher: 34.3ms

Limiter Mode

0000: 1.2ms

0001: 2.4ms

0010: 4.8ms ….(time doubles

for every step)

1010 or higher: 1.2288s

Frequency Dependant Decay Enable (Limiter only):

0 : disabled

1 : enabled

DCY

20kHz input (or disabled)

1kHz input

R18 (12h)

0011000

ALC Control 3

FDECAY

0000

0001

0010

……

1010 or higher

1.2ms

2.4ms

4.8ms

……

1.2288ms

24ms

28ms

96ms

……

24.576s

NGAT

Noise Gate Enable (ALC only):

0 : disabled

1 : enabled

R19 (13h)

0010011

Noise Gate

Control

4:2

NGTH

000

Noise Gate Threshold:

000: -78dBFS

001: -72dBfs

… 6 dB steps

110: -42dBFS

111: -36dBFS

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