wm8952 Wolfson Microelectronics plc, wm8952 Datasheet - Page 16

• Manufacturer Part Number: wm8952
• Description: Mono Adc With Microphone Pre-amplifier
• Manufacturer: Wolfson Microelectronics plc

WM8952
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Table 2 Input Control
The input PGA is enabled by the IPPGAEN register bit.
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.
R44
Input Control
R2
Power
Management 2
REGISTER
ADDRESS
REGISTER
ADDRESS
2
1
0
BIT
2
BIT
AUX2INPPGA
MICN2INPPGA
MICP2INPPGA
LABEL
INPPGAEN
LABEL
0
1
0
DEFAULT
0
DEFAULT
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
Input microphone PGA enable
0 = disabled
1 = enabled
DESCRIPTION
PP, Rev 3.0, December 2008
DESCRIPTION
Pre Production
16