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WM8976 Datasheet(PDF) 25 Page - Wolfson Microelectronics plc

Part # WM8976
Description  Low Power CODEC With Speaker Driver
PDF  83 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8976 Datasheet(HTML) 25 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8976
w
PTD Rev 2.0 February 2005
25
The input PGA is enabled by the IPPGAENL register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2
Power
Management
2
2
INPPGAENL
0
Left channel input PGA enable
0 = disabled
1 = enabled
Table 5 Input PGA Enable Register Settings
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
LIP2INPPGA
1
Connect LIP pin to left channel input PGA
amplifier positive terminal.
0 = LIP not connected to input PGA
1 = input PGA amplifier positive terminal
connected to LIP (constant input
impedance)
1
LIN2INPPGA
1
Connect LIN pin to left channel input PGA
negative terminal.
0=LIN not connected to input PGA
1=LIN connected to input PGA amplifier
negative terminal.
R44
Input
Control
2
L2_2INPPGA
0
Connect L2 pin to left channel input PGA
positive terminal.
0=L2 not connected to input PGA
1=L2 connected to input PGA amplifier
positive terminal (constant input
impedance).
Table 6 Input PGA Control
INPUT PGA VOLUME CONTROLS
The input microphone PGA has a gain range from -12dB to +35.25dB in 0.75dB steps. The gain
from the LIN input to the PGA output and from the L2 amplifier to the PGA output are always
common and controlled by the register bits INPPGAVOLL[5:0]. These register bits also affect the
LIP pin when LIP2INPPGA=1, the L2 pin when L2_2INPPGA=1 and the L2 pin when
L2_2INPPGA=1.
When the Automatic Level Control (ALC) is enabled the input PGA gain is controlled automatically
and the INPPGAVOLL bits should not be used.



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