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WM8950 датащи(PDF) 16 Page - Wolfson Microelectronics plc

номер детали WM8950
подробное описание детали  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
PDF  52 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8950 датащи(HTML) 16 Page - Wolfson Microelectronics plc

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WM8950
Preliminary Technical Data
w
PTD Rev 2.1 June 2005
16
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 Auxiliary 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.
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.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
2:0
AUX2BOOSTVOL
000
Controls the auxiliary amplifer to the input
boost stage:
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
R47
Input BOOST
control
6:4
MICP2BOOSTVOL
000
Controls the MICP pin to the input boost
stage (NB, when using this path set
MICPZIUNPPGA=0):
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
Table 4 Input BOOST Stage Control



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