WM8978 datasheet(19/78 Pages) WOLFSON

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WM8978

PP Rev 1.7 January 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

5:0

INPPGAVOLL

010000

Left channel input PGA volume

000000 = -12dB

000001 = -11.25db

010000 = 0dB

111111 = 35.25dB

INPPGAMUTEL

Mute control for left channel input PGA:

0=Input PGA not muted, normal

operation

1=Input PGA muted (and disconnected

from the following input BOOST stage).

INPPGAZCL

Left channel input PGA zero cross

enable:

0=Update gain when gain register

changes

1=Update gain on 1

st zero cross after

gain register write.

R45

Left channel

input PGA

volume

control

INPPGAUPDATE

Not

latched

INPPGAVOLL and INPPGAVOLR

volume do not update until a 1 is written

to INPPGAUPDATE (in reg 45 or 46)

5:0

INPPGAVOLR

010000

Right channel input PGA volume

000000 = -12dB

000001 = -11.25db

010000 = 0dB

111111 = +35.25dB

INPPGAMUTER

Mute control for right channel input

PGA:

0=Input PGA not muted, normal

operation

1=Input PGA muted (and disconnected

from the following input BOOST stage).

INPPGAZCR

Right channel input PGA zero cross

enable:

0=Update gain when gain register

changes

1=Update gain on 1

st zero cross after

gain register write.

R46

Right

channel

input PGA

volume

control

INPPGAUPDATE

Not

latched

INPPGAVOLL and INPPGAVOLR

volume do not update until a 1 is written

to INPPGAUPDATE (in reg 45 or 46)

R32

ALC control

8:7

ALCSEL

ALC function select:

00=ALC off

01=ALC right only

10=ALC left only

11=ALC both on

Table 4 Input PGA Volume Control

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