WM8776 datasheet(45/55 Pages) WOLFSON

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WM8776

PP Rev 1.91 June 2004

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

R18 (12h)

0011000

ALC Control 3

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

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

Maximum attenuation of PGA

3:0

MAXATTEN

[3:0]

0110

Limiter (attenuation below

static)

0011 or lower: -3dB

0100: -4dB

…. (-1dB steps)

1100 or higher: -12dB

ALC (lower PGA gain limit)

1010 or lower: -1dB

1011 : -5dB

….. (-4dB steps)

1110 : -17dB

1111 : -21dB

R20 (14h)

0010100

Limiter

Control

6:4

TRANWIN [2:0]

010

Length of Transient Window

000: 0us (disabled)

001: 62.5us

010: 125us

…..

111: 4ms

4:0

AMX[4:0]

00001

ADC left channel input mixer control bit

AMX[4:0]

ADC LEFT IN

ADC RIGHT IN

00001

AIN1L

AIN1R

00010

AIN2L

00100

AIN3L

AIN3R

01000

AIN4L

AIN4R

10000

AIN5L

AIN5R

MUTERA

Mute for right channel ADC

0: Mute off

1: Mute on

R21 (15h)

0010101

ADC Mux

Control

MUTELA

Mute for left channel ADC

0: Mute off

1: Mute on

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