WM8976 datasheet(35/83 Pages) WOLFSON

номер детали	WM8976

подробное описание детали	Low Power CODEC With Speaker Driver

PDF	83 Pages

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производитель	WOLFSON [Wolfson Microelectronics plc]

домашняя страница	http://www.wolfsonmicro.com

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Preliminary Technical Data

WM8976

PTD Rev 2.0 February 2005

ALCMODE

Determines the ALC mode of

operation:

0=ALC mode

1=Limiter mode.

Decay (gain ramp-up) time

(ALCMODE ==0)

Per

step

Per

6dB

90% of

range

0000

410us

3.3ms

24ms

0001

820us

6.6ms

48ms

0010

1.64ms

13.1ms

192ms

… (time doubles with every step)

0011

(13ms/6dB)

1010

high

420ms

3.36s

24.576s

Decay (gain ramp-up) time

(ALCMODE ==1)

Per

step

Per

6dB

90% of

range

0000

90.8us

726.4us

5.26ms

0001

181.6us

1.453ms

10.53ms

0010

363.2us

2.905ms

21.06ms

… (time doubles with every step)

7:4

ALCDCY

[3:0]

0011

(2.9ms/6dB)

1010

93ms

744ms

5.39s

ALC attack (gain ramp-down) time

(ALCMODE == 0)

Per

step

Per

6dB

90% of

range

0000

104us

832us

6ms

0001

208us

1.664ms

12ms

0010

416us

3.328ms

24.1ms

… (time doubles with every step)

0010

(832us/6dB)

1010

high

106ms

852ms

6.18s

ALC attack (gain ramp-down) time

(ALCMODE == 1)

Per

step

Per

6dB

90% of

range

0000

22.7us

182.4us

1.31ms

0001

45.4us

363.2us

2.62ms

0010

90.8us

726.4us

5.26ms

… (time doubles with every step)

R34

ALC Control

3:0

ALCATK

[3:0]

0010

(182us/6dB)

1010

23.2ms

186ms

1.348s

Table 19 ALC Control Registers

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