WM8976 datasheet(34/83 Pages) WOLFSON

Part #	WM8976

Description	Low Power CODEC With Speaker Driver

PDF	83 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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34 / 83 page

WM8976

Preliminary Technical Data

PTD Rev 2.0 February 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ALCSEL

ALC function select

0=ALC disabled

1=ALC enabled

5:3

ALCMAXGAIN

[2:0]

111

(+35.25dB)

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

R32

ALC Control

2:0

ALCMINGAIN

[2:0]

000 (-12dB)

Set minimum gain of PGA

000=-12dB

001=-6dB

010=0dB

011=+6dB

100=+12dB

101=+18dB

110=+24dB

111=+30dB

7:4

ALCHLD

[3:0]

0000

(0ms)

ALC hold time before gain is

increased.

0000 = 0ms

0001 = 2.67ms

0010 = 5.33ms

… (time doubles with every step)

1111 = 43.691s

3:0

ALCLVL

[3:0]

1011

(-12dB)

ALC target – sets signal level at

ADC input

0000 = -28.5dB FS

0001 = -27.0dB FS

… (1.5dB steps)

1110 = -7.5dB FS

1111 = -6dB FS

R33

ALC Control

ALCZC

0 (zero cross

off)

ALC uses zero cross detection

circuit.

WM8976 Datasheet(PDF) 34 Page - Wolfson Microelectronics plc

WM8976 Datasheet(HTML) 34 Page - Wolfson Microelectronics plc

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