WM8986_07 WOLFSON [Wolfson Microelectronics plc], WM8986_07 Datasheet - Page 26

• Manufacturer Part Number: WM8986_07
• Description: Multimedia DAC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8986
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INPUT PGA VOLUME CONTROLS
The input microphone PGAs have a gain range from -12dB to +35.25dB in 0.75dB steps. The gain
from the LIN/RIN input to the PGA output is controlled by the register bits INPPGAVOLL[5:0] and
INPPGABVOLR[5:0]. These register bits also affect the LIP pin when LIP2INPPGA=1 and the RIP
pin when RIP2INPPGA=1.
Table 6 Input PGA Volume Control
R45 (20h)
Left channel
input PGA
volume
control
R46 (2Eh)
Right
channel
input PGA
volume
control
REGISTER
ADDRESS
5:0
6
7
8
5:0
6
7
8
BIT
INPPGAVOLL
INPPGAMUTEL
INPPGAZCL
INPPGAVU
INPPGAVOLR
INPPGAMUTER
INPPGAZCR
INPPGAVU
LABEL
010000
(0dB)
0
0
Not
latched
010000
(0dB)
0
0
Not
latched
DEFAULT
Left channel input PGA volume
000000 = -12dB
000001 = -11.25db
.
010000 = 0dB
.
111111 = +35.25dB
Mute control for left channel input PGA:
0 = Input PGA not muted, normal
operation
1 = Input PGA muted (and disconnected
from the following input BOOST stage).
Left channel input PGA zero cross
enable:
0 = Update gain when gain register
changes
1 = Update gain on 1
gain register write.
INPPGA left and INPPGA right volume
do not update until a 1 is written to
INPPGAVU (in reg 45 or 46)
(See "Volume Updates" below)
Right channel input PGA volume
000000 = -12dB
000001 = -11.25db
.
010000 = 0dB
.
111111 = +35.25dB
Mute control for right channel input
PGA:
0 = Input PGA not muted, normal
operation
1 = Input PGA muted (and disconnected
from the following input BOOST stage).
Right channel input PGA zero cross
enable:
0 = Update gain when gain register
changes
1 = Update gain on 1
gain register write.
INPPGA left and INPPGA right volume
do not update until a 1 is written to
INPPGAVU (in reg 45 or 46)
(See "Volume Updates" below)
DESCRIPTION
PP, Rev 3.1, February 2007
st
st
zero cross after
zero cross after
Pre-Production
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