WM8940GEFL/V Wolfson Microelectronics, WM8940GEFL/V Datasheet - Page 19

• Manufacturer Part Number: WM8940GEFL/V
• Description: Audio CODECs Mono CODEC with Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8940GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Production Data
Figure 6 Microphone Input PGA Circuit (switch positions shown are for differential mic
input)
Table 2 Input Control
The input PGA is enabled by the IPPGAEN register bit.
Table 3 Input PGA Enable Control
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
DESCRIPTION
PD, Rev 4.2, April 2008
WM8940
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