WM8985GEFLSLASHR datasheet(100/118 Pages) WOLFSON

номер детали	WM8985GEFL/R

подробное описание детали	Multimedia CODEC With Class D Headphone and Line Out

PDF	118 Pages

Scroll/Zoom	100%

производитель	WOLFSON [Wolfson Microelectronics plc]

домашняя страница	http://www.wolfsonmicro.com

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100 / 118 page

WM8985

Pre-Production

PP, Rev 3.4, October 2006

100

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

8:7

ALCSEL

ALC function select:

00=ALC off

01=ALC right only

10=ALC left only

11=ALC both on

Input Limiter/

Automatic

Level Control

(ALC)

Reserved. Initialise to 0

5:3

ALCMAXGAIN

111

Set Maximum Gain of PGA

111=+35.25dB

110=+29.25dB

101=+23.25dB

100=+17.25dB

011=+11.25dB

010=+5.25dB

001=-0.75dB

000=-6.75dB

Input Limiter/

Automatic

Level Control

(ALC)

32 (20h)

2:0

ALCMINGAIN

000

Set minimum gain of PGA

000=-12dB

001=-6dB

010=0dB

011=+6dB

100=+12dB

101=+18dB

110=+24dB

111=+30dB

Input Limiter/

Automatic

Level Control

(ALC)

7:4

ALCHLD

0000

ALC hold time before gain is increased.

0000 = 0ms

0001 = 2.67ms

0010 = 5.33ms

… (time doubles with every step)

1111 = 43.691s

Input Limiter/

Automatic

Level Control

(ALC)

33 (21h)

3:0

ALCLVL

1011

ALC target – sets signal level at ADC input

1111 : -1.5dBFS

1110 : -1.5dBFS

1101 : -3dBFS

1100 : -4.5dBFS

...... (-1.5dB steps)

0001 : -21dBFS

0000 : -22.5dBFS

Input Limiter/

Automatic

Level Control

(ALC)

ALCMODE

Determines the ALC mode of operation:

0=ALC mode

1=Limiter mode

Input Limiter/

Automatic

Level Control

(ALC)

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

1010

higher

420ms

3.36s

24.576s

34 (22h)

7:4

ALCDCY

[3:0]

0011

Decay (gain ramp-up) time

(ALCMODE ==1)

Input Limiter/

Automatic

Level Control

(ALC)

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