WM8952ECSSLASHRV datasheet(17/72 Pages) WOLFSON

17 / 72 page

Pre Production

WM8952

PP, Rev 3.1, June 2011

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R44

Input Control

AUX2INPPGA

Select AUX amplifier output as input PGA

signal source.

0=AUX not connected to input PGA

1=AUX connected to input PGA amplifier

negative terminal.

MICN2INPPGA 1

Connect MICN to input PGA negative

terminal.

0=MICN not connected to input PGA

1=MICN connected to input PGA amplifier

negative terminal.

MICP2INPPGA 0

Connect input PGA amplifier positive

terminal to MICP or VMID.

0 = input PGA amplifier positive terminal

connected to VMID

1 = input PGA amplifier positive terminal

connected to MICP through variable resistor

string

Table 2 Input Control

The input PGA is enabled by the IPPGAEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

Management 2

INPPGAEN

Input microphone PGA enable

0 = disabled

1 = enabled

Table 3 Input PGA Enable 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 MICN input to the PGA output and from the AUX amplifier to the PGA output are always

common and controlled by the register bits INPPGAVOL[5:0]. These register bits also affect the

MICP pin when MICP2INPPGA=1.

When the Automatic Level Control (ALC) is enabled the input PGA gain is then controlled

automatically and the INPPGAVOL bits should not be used.

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