wm8974gefl-v Wolfson Microelectronics plc, wm8974gefl-v Datasheet - Page 15

• Manufacturer Part Number: wm8974gefl-v
• Description: Mono Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

Production Data
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Figure 6 Microphone Input PGA Circuit (switch positions shown are for differential mic
input)
The input PGA is enabled by the IPPGAEN register bit.
R44
Input Control
R2
Power
Management 2
REGISTER
ADDRESS
REGISTER
ADDRESS
0
1
2
BIT
2
BIT
MICP2INPPGA
MICN2INPPGA
AUX2INPPGA
LABEL
INPPGAEN
LABEL
1
1
0
DEFAULT
0
DEFAULT
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
Connect MICN to input PGA negative terminal.
0=MICN not connected to input PGA
1=MICN connected to input PGA amplifier
negative terminal.
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.
Input microphone PGA enable
0 = disabled
1 = enabled
PD, Rev 4.5, September 2008
DESCRIPTION
DESCRIPTION
WM8974
15