WM8976 datasheet(30/108 Pages) WOLFSON

номер детали	WM8976

подробное описание детали	Stereo CODEC With Speaker Driver

PDF	108 Pages

Scroll/Zoom	100%

производитель	WOLFSON [Wolfson Microelectronics plc]

домашняя страница	http://www.wolfsonmicro.com

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30 / 108 page

WM8976

Pre-Production

PP Rev 3.0 April 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ALCZC

0 (zero

cross off)

ALC uses zero cross detection circuit.

0 = Disabled (recommended)

1 = Enabled

7:4

ALCHLD

[3:0]

0000

(0ms)

ALC hold time before gain is

increased.

0000 = 0ms

0001 = 2.67ms

0010 = 5.33ms

0011 = 10.66ms

0100 = 21.32ms

0101 = 42.64ms

0110 = 85.28ms

0111 = 0.17s

1000 = 0.34s

1001 = 0.68s

1010 or higher = 1.36s

ALCMODE

Determines the ALC mode of

operation:

0 = ALC mode (Normal Operation)

1 = Limiter mode.

Decay (gain ramp-up) time

(ALCMODE ==0)

Per

step

Per

6dB

90% of

range

0000

410us

3.38ms

23.6ms

0001

820us

6.56ms

47.2ms

0010

1.64ms

13.1ms

94.5ms

… (time doubles with every step)

0011

(26ms/6dB)

1010

higher

420ms

3.36s

24.2s

Decay (gain ramp-up) time

(ALCMODE ==1)

Per

step

Per

6dB

90% of

range

0000

90.8us

726us

5.23ms

0001

182us

1.45ms

10.5ms

0010

363us

2.91ms

20.9ms

… (time doubles with every step)

7:4

ALCDCY

[3:0]

0011

(5.8ms/6dB)

1010

93ms

744ms

5.36s

ALC attack (gain ramp-down) time

(ALCMODE == 0)

Per

step

Per

6dB

90% of

range

0000

104us

832us

6ms

0001

208us

1.66ms

12ms

0010

416us

3.33ms

24ms

… (time doubles with every step)

0010

(3.3ms/6dB)

1010

higher

106ms

852ms

6.13s

ALC attack (gain ramp-down) time

(ALCMODE == 1)

R34 (22h)

ALC Control

3:0

ALCATK

[3:0]

0010

(726us/6dB)

Per

step

Per

6dB

90% of

range

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