WM8940CGEFLSLASHV datasheet(22/91 Pages) WOLFSON

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WM8940

Production Data

PD, Rev 4.3, November 2011

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R45

Input PGA gain

control

INPPGAMUTE

Mute control for input PGA:

0=Input PGA not muted, normal operation

1=Input PGA muted (and disconnected from

the following input BOOST stage).

R47

Input BOOST

control

PGABOOST

0 = PGA output has +0dB gain through input

BOOST stage.

1 = PGA output has +20dB gain through

input BOOST stage.

Table 6 Input BOOST Stage Control

The Auxiliary amplifier path to the BOOST stage is controlled by the AUX2BOOSTVOL[2:0] register

bits.

When AUX2BOOSTVOL=000 this path is completely disconnected from the BOOST stage.

Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB.

The MICP path to the BOOST stage is controlled by the MICP2BOOSTVOL[2:0] register bits. When

MICP2BOOSTVOL=000 this input pin is completely disconnected from the BOOST stage. Settings

001 through to 111 control the gain in 3dB steps from -12dB to +6dB.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R47

Input BOOST

control

6:4

MICP2BOOSTVOL

000

Controls the MICP pin to the input boost

stage (NB, when using this path set

MICP2INPPGA=0):

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

2:0

AUX2BOOSTVOL

000

Controls the auxiliary amplifier to the input

boost stage:

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

Table 7 Input BOOST Stage Control

The BOOST stage is enabled under control of the BOOSTEN register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 2

BOOSTEN

Input BOOST enable

0 = Boost stage OFF

1 = Boost stage ON

Table 8 Input BOOST Enable Control

MICROPHONE BIASING CIRCUIT

The MICBIAS output provides a low noise reference voltage suitable for biasing electret type

microphones and the associated external resistor biasing network. Refer to the Applications

Information section for recommended external components. The MICBIAS voltage can be altered via

the MBVSEL register bit.

When MBVSEL=0, MICBIAS=0.9*AVDD and when MBVSEL=1,

MICBIAS=0.65*AVDD. The output can be enabled or disabled using the MICBEN control bit.

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