WM8976GEFL/V Wolfson Microelectronics, WM8976GEFL/V Datasheet - Page 23

• Manufacturer Part Number: WM8976GEFL/V
• Description: Audio CODECs Mono ADC Stereo DAC with Spkr
• Manufacturer: Wolfson Microelectronics

Specifications of WM8976GEFL/V

• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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Table 5 Input PGA Control
INPUT PGA VOLUME CONTROL
Table 6 Input PGA Volume Control
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 is 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 gains are controlled automatically
and the INPPGAVOLL bits should not be used.
R44
Input
Control
R45
Input PGA
volume
control
R32
ALC control
1
REGISTER
REGISTER
ADDRESS
ADDRESS
0
1
2
5:0
6
7
8
8
BIT
BIT
LIP2INPPGA
LIN2INPPGA
L2_2INPPGA
INPPGAVOLL
INPPGAMUTEL
INPPGAZCL
INPPGAUPDATE
ALCSEL
LABEL
LABEL
1
1
0
DEFAULT
010000
0
0
Not
latched
0
DEFAULT
Connect LIP pin to input PGA amplifier
positive terminal.
0 = LIP not connected to input PGA
1 = input PGA amplifier positive terminal
connected to LIP (constant input
impedance)
Connect LIN pin to input PGA negative
terminal.
0=LIN not connected to input PGA
1=LIN connected to input PGA amplifier
negative terminal.
Connect L2 pin to input PGA positive
terminal.
0=L2 not connected to input PGA
1=L2 connected to input PGA amplifier
positive terminal (constant input
impedance).
Input PGA volume
000000 = -12dB
000001 = -11.25db
.
010000 = 0dB
.
111111 = 35.25dB
Mute control for input PGA:
0=Input PGA not muted, normal
operation
1=Input PGA muted (and disconnected
from the following input BOOST stage).
Input PGA zero cross enable:
0=Update gain when gain register
changes
1=Update gain on 1
gain register write.
INPPGAVOLL volume does not update
until a 1 is written to INPPGAUPDATE
ALC function select:
0=ALC off
1=ALC on
DESCRIPTION
DESCRIPTION
st
PD Rev 4.4 July 2009
zero cross after
WM8976
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