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WM8758B Datasheet(PDF) 31 Page - Wolfson Microelectronics plc

Part # WM8758B
Description  Stereo CODEC with Headphone Driver and Line Out
PDF  90 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8758B Datasheet(HTML) 31 Page - Wolfson Microelectronics plc

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Production Data
WM8758B
w
PD, Rev 4.4, January 2012
31
INPUT BOOST
Each of the stereo input PGA stages is followed by an input BOOST circuit. The input BOOST circuit
has 3 selectable inputs: the input microphone PGA output, the L2/R2 input pin (can be used as a line
input, bypassing the input PGA), and OUT4 mixer output. These three inputs can be mixed together
and have individual gain boost/adjust as shown in Figure 17.
Figure 17 Input Boost Stage
The input PGA paths can have a +20dB boost (PGABOOSTL/R=1), a 0dB pass through
(PGABOOSTL/R=0) or be completely isolated from the input boost circuit (INPPGAMUTEL/R=1).
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R47
Left Input
BOOST
control
8
PGABOOSTL
1
Boost enable for left channel input
PGA:
0 = PGA output has +0dB gain through
input BOOST stage.
1 = PGA output has +20dB gain
through input BOOST stage.
R48
Right Input
BOOST
control
8
PGABOOSTR
1
Boost enable for right channel input
PGA:
0 = PGA output has +0dB gain through
input BOOST stage.
1 = PGA output has +20dB gain
through input BOOST stage.
Table 7 Input BOOST Stage Control



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