WM8940 datasheet(21/88 Pages) CIRRUS

номер детали	WM8940

подробное описание детали	Mono CODEC with Speaker Driver

PDF	88 Pages

Scroll/Zoom	100%

производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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21 / 88 page

WM8940

Rev 4.4

Output from

AUX amp

MICP

MICN

VMID

AUX2INPPGA

R44[2]

MICN2INPPGA

R44[1]

MICP2INPPGA

R44[0]

To input

BOOST/mix

stage

INPPGAVOL

R45[5:0]

Gain=-12 to +35.25dB

Figure 6 Microphone Input PGA Circuit (switch positions shown are for differential mic input)

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

Connect MICN to input PGA negative

terminal.

0=MICN not connected to input PGA

1=MICN connected to input PGA amplifier

negative terminal.

MICP2INPPGA

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

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