WM8941GEFL/RV Wolfson Microelectronics, WM8941GEFL/RV Datasheet - Page 23

• Manufacturer Part Number: WM8941GEFL/RV
• Description: Audio CODECs Mono CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8941GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pre Production
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INPUT BOOST
Table 6 Input BOOST Stage Control
The input BOOST circuit has 3 selectable inputs: the input microphone PGA output, the AUX
amplifier output and the MICP input pin (when not using a differential microphone configuration).
These three inputs can be mixed together and have individual gain boost/adjust as shown in Figure
8.
The input PGA path can have a +20dB boost (PGABOOST=1) a 0dB pass through (PGABOOST=0)
or be completely isolated from the input boost circuit (INPPGAMUTE=1).
The Auxiliary amplifier path to the BOOST stage is controlled by the AUX2BOOSTVOL[2:0] register
bits.
Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB.
The MICP path to the BOOST stage is controlled by the MICP2BOOSTVOL[2:0] register bits.
When MICP2BOOSTVOL=000 this input pin is completely disconnected from the BOOST stage.
Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB.
Figure 8 Input Boost Stage
R45
Input PGA gain
control
R47
Input BOOST
control
REGISTER
ADDRESS
When AUX2BOOSTVOL=000 this path is completely disconnected from the BOOST stage.
6
8
BIT
INPPGAMUTE
PGABOOST
LABEL
1
0
DEFAULT
Mute control for input PGA:
0=Input PGA not muted, normal operation
1=Input PGA muted (and disconnected from
the following input BOOST stage).
0 = PGA output has +0dB gain through
input BOOST stage.
1 = PGA output has +20dB gain through
input BOOST stage.
DESCRIPTION
PP, Rev 3.3, December 2007
WM8941
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