WM8940CGEFL(2011) 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8940CGEFL
(Rev.:2011)

Mono CODEC with Speaker Driver

Wolfson Microelectronics plc 

Production Data

WM8940

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

input)

REGISTER

ADDRESS

R44

Input Control

BIT

LABEL

2 AUX2INPPGA

DEFAULT

0

1 MICN2INPPGA 1

0 MICP2INPPGA 0

Table 2 Input Control

DESCRIPTION

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.

Connect MICN to input PGA negative

terminal.

0=MICN not connected to input PGA

1=MICN connected to input PGA amplifier

negative terminal.

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

The input PGA is enabled by the IPPGAEN register bit.

REGISTER

ADDRESS

R2

Power

Management 2

BIT

2

LABEL

INPPGAEN

Table 3 Input PGA Enable Control

DEFAULT

DESCRIPTION

0

Input microphone PGA enable

0 = disabled

1 = enabled

w

PD, Rev 4.3, November 2011

19

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