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WM8974 데이터시트(PDF) 17 Page - Wolfson Microelectronics plc

부품명 WM8974
상세설명  MONO CODEC WITH SPEAKER DRIVER
PDF  63 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8974 데이터시트(HTML) 17 Page - Wolfson Microelectronics plc

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WM8974
w
PP Rev 1.1 September 2004
17
In mixer mode (AUXMODE=1) the on-chip input resistor is bypassed, this allows the user to sum in
multiple inputs with the use of external resistors.
When used in this mode there will be gain
variations through this path from part to part due to the variation of the internal 20kΩ resistors
relative to the higher tolerance external resistors.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R1
Power
management 1
6
AUXEN
0
Auxilliary input buffer enable
0 = OFF
1 = ON
R44
Input control
3
AUXMODE
0
0 = inverting buffer
1 = mixer (on-chip input resistor bypassed)
Table 2 Auxilliary Input Buffer Control
INPUT BOOST
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.
Figure 8 Input Boost Stage
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).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R45
Input PGA gain
control
6
INPPGAMUTE
0
Mute control for input PGA:
0=Input PGA not muted, normal operation
1=Input PGA muted (and disconnected from
the following input BOOST stage).
R47
Input BOOST
control
8
PGABOOST
1
0 = PGA output has +0dB gain through
input BOOST stage.
1 = PGA output has +20dB gain through
input BOOST stage.
Table 3 Input BOOST Stage Control
The Auxilliary amplifier path to the BOOST stage is controlled by the AUX2BOOSTVOL[2:0] register
bits.
When AUX2BOOSTVOL=000 this path is completely disconnected from the BOOST stage.
Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB.



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