WM8976 datasheet(22/108 Pages) WOLFSON

22 / 108 page

WM8976

Pre-Production

PP Rev 3.0 April 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LIP2INPPGA

Connect LIP pin to input PGA amplifier

positive terminal.

0 = LIP not connected to input PGA

1 = input PGA amplifier positive terminal

connected to LIP (constant input

impedance)

LIN2INPPGA

Connect LIN pin to input PGA negative

terminal.

0=LIN not connected to input PGA

1=LIN connected to input PGA amplifier

negative terminal.

R44

Input

Control

L2_2INPPGA

Connect L2 pin to input PGA positive

terminal.

0=L2 not connected to input PGA

1=L2 connected to input PGA amplifier

positive terminal (constant input

impedance).

Table 4 Input PGA Control

INPUT PGA VOLUME CONTROL

The input microphone PGA has a gain range from -12dB to +35.25dB in 0.75dB steps. The gain

from the LIN input to the PGA output and from the L2 amplifier to the PGA output is always common

and controlled by the register bits INPPGAVOLL[5:0]. These register bits also affect the LIP pin

when LIP2INPPGA=1, the L2 pin when L2_2INPPGA=1 and the L2 pin when L2_2INPPGA=1.

When the Automatic Level Control (ALC) is enabled the input PGA gains are controlled

automatically and the INPPGAVOLL bits should not be used.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

5:0

INPPGAVOLL

010000

Input PGA volume

000000 = -12dB

000001 = -11.25db

010000 = 0dB

111111 = 35.25dB

INPPGAMUTEL

Mute control for input PGA:

0=Input PGA not muted, normal

operation

1=Input PGA muted (and disconnected

from the following input BOOST stage).

INPPGAZCL

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

Input PGA

volume

control

INPPGAUPDATE

Not

latched

INPPGAVOLL volume does not update

until a 1 is written to INPPGAUPDATE

R32

ALC control

ALCSEL

ALC function select:

0=ALC off

1=ALC on

Table 5 Input PGA Volume Control

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