ad1881a Analog Devices, Inc., ad1881a Datasheet - Page 13

• Manufacturer Part Number: ad1881a
• Description: Ac?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

PC Beep Register (Index 0Ah)
PCV[3:0]
PCM
Phone Volume (Index 0Ch)
PHV[4:0]
PHM
MIC Volume (Index 0Eh)
MCV[4:0]
M20
MCM
Line In Volume (Index 10h)
RLV[4:0]
LLV[4:0]
LM
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 h
0 h
0 h
0 h
0
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 h
0 h
0 h
0 h
0
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 h
0 h
0 h
0 h
0
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 1 h
0 1 h
0 1 h
0 1 h
0 1
A
A
A
A
A
C
C
C
C
C
E
E
E
E
E
e
e
e
e
e
u
u
u
u
u
e
e
e
e
e
u
u
u
u
u
e
e
e
e
e
u
u
u
u
u
e
e
e
e
e
u
u
u
u
u
h
g
h
g
g
h
g
h
m
m
m
m
N
N
N
M
M
M
N
N
N
L
L
L
N
N
M
M
N
N
L
L
N
N
N
N
N
P
P
P
P
P
N
N
N
N
N
P
P
P
P
P
n i
n i
n i
n i
n i
a
a
a
a
a
a
a
a
a
a
c i
c i
c i
C
C
C
C
C
h
h
h
h
h
c i
c i
a
a
a
a
a
a
a
a
a
a
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
o
o
o
e
e
e
e
e
m
m
m
m
o
o
_
_
_
_
_
V
V
V
n
n
n
V
V
n
n
e
e
e
e
e
e
B
B
B
B
B
e
e
e
e
n I
n I
n I
n I
n I
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
o
o
o
o
o
E
E
E
E
E
u l
u l
u l
u l
u l
V
V
V
V
V
V
V
V
V
V
E
E
E
E
E
o
o
o
o
o
o
o
o
m
m
m
m
m
o
o
P
P
P
P
P
u l
u l
u l
u l
u l
u l
u l
u l
u l
u l
e
e
e
e
e
V
V
V
V
V
m
m
m
m
m
m
m
m
m
m
PC Beep Volume Control. The least significant bit represents 3 dB attenuation. This register controls the output
from 0 dB to a maximum attenuation of –45 dB. The PC Beep is routed to Left and Right Line outputs even when
the RESET pin is asserted. This is so that Power on Self-Test (POST) codes can be heard by the user in case of a
hardware problem with the PC.
PC Beep Mute. When this bit is set to “1,” the channel is muted.
Phone Volume. Allows setting the Phone Volume Attenuator in 32 steps. The LSB represents 1.5 dB, and the
range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Phone Mute. When this bit is set to “1,” the channel is muted.
MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 steps. The LSB represents 1.5 dB, and the
range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Microphone 20 dB Gain Block
MIC Mute. When this bit is set to “1,” the channel is muted.
Right Line In Volume. Allows setting the Line In right channel attenuator in 32 steps. The LSB represents 1.5 dB,
and the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Line In Volume Left. Allows setting the Line In left channel attenuator in 32 steps. The LSB represents 1.5 dB, and
the range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Line In Mute. When this bit is set to “1,” the channel is muted.
o
o
o
o
o
D 5 1
D 5 1
D 5 1
D 5 1
D
M M
M M
M M
M M
M
e
e
e
e
e
e
e
e
e
e
u l
u l
u l
u l
u l
0 = Disabled; Gain = 0 dB.
1 = Enabled; Gain = 20 dB.
5 1
C
C
C
C
C
m
m
m
m
m
D 5 1
D 5 1
D 5 1
LM
LM
LM
D 5 1
D
LM
L
M
M
e
e
e
e
e
D 5 1
D 5 1
D 5 1
D 5 1
D
P M
P M
P M
P M
P
5 1
H
H
H
H
H
5 1
D 5 1
D 5 1
D 5 1
P M
P M
P M
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
D 5 1
D
P M
P
M
D 4 1
D 4 1
D 4 1
X X X X X
C
C
C
C
C
D 4 1
D
4 1
5 1
M
4 1
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
4 1
D 3 1
D 3 1
D 3 1
X X X X X
D 3 1
D
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
D 3 1
D 3 1
D 3 1
D 3 1
D
X X X X X
3 1
4 1
3 1
PCM
0
0
1
D 3 1
D 3 1
D 3 1
D 3 1
D
X X X X X
3 1
D 2 1
D 2 1
D 2 1
D 2 1
D
X X X X X
D 2 1
D 2 1
D 2 1
D 2 1
D
L
L
L
L
L
D 3 1
D 3 1
D 3 1
D 3 1
D
X X X X X
2 1
L
L
L
L
L
2 1
3 1
V
V
V
V
V
D 2 1
D 2 1
D 2 1
X X X X X
D 2 1
D
4
4
4
4
4
2 1
D 1 1
D 1 1
D 1 1
D 1 1
D
X X X X X
D 2 1
D 2 1
D 2 1
D 2 1
D
X X X X X
D 1 1
D 1 1
D 1 1
D 1 1
D
L
L
L
L
L
1 1
2 1
L
L
L
L
L
1 1
PCV3 . . . PCV0
0000
1111
xxxx
V
V
V
V
V
D 1 1
D 1 1
D 1 1
D 1 1
D
X X X X X
3
3
3
3
3
1 1
D 0 1
D 0 1
D 0 1
D 0 1
D
X X X X X
D 1 1
D 1 1
D 1 1
X X X X X
D 1 1
D
0 1
D 0 1
D 0 1
D 0 1
L
L
L
D 0 1
D
L
L
1 1
L
L
L
L
L
0 1
D 0 1
D 0 1
D 0 1
D 0 1
D
X X X X X
V
V
V
V
V
0 1
2
2
2
2
2
D9
D9
D9
D9
D
X X X X X
D 0 1
D 0 1
D 0 1
X X X X X
D 0 1
D
9
D9
D9
D9
D
D9
L
L
L
L
L
0 1
L
L
L
L
L
D9
D9
D9
D9
D
X X X X X
9
V
V
V
V
V
D8
D8
D8
D8
D
X X X X X
9
1
1
1
1
1
8
D9
D9
D9
D9
D
X X X X X
9
D8
D8
D8
D
D8
L
L
L
L
L
D8
D8
D8
D8
D
X X X X X
D7
D7
D7
L
L
L
L
L
D7
D
8
8
X X X X X
V
V
V
V
V
7
D8
D8
D8
D8
D
X X X X X
0
0
0
0
0
8
D7
D7
D7
D7
D
D6
D6
D6
M 0 2
M 0 2
M 0 2
D7
D7
D7
Function
0 dB Attenuation
–45 dB Attenuation
–∞ dB Attenuation
D6
D
M 0 2
M
D7
D
7
X X X X X
6
7
D7
D7
D7
D7
D
0 2
7
D6
D6
D6
D6
D
D6
D6
D6
D
D6
X X X X X
6
D5
D5
D5
D5
D
X X X X X
6
D6
D6
D6
D6
D
5
6
D5
D5
D5
D
D5
X X X X X
D5
D5
D5
D5
D
X X X X X
5
5
D4
D4
D4
D4
D
M
M
M
M
M
D5
D5
D5
D5
D
X X X X X
4
C
C
C
C
C
D4
D4
D4
D
D4
R
R
R
R
R
5
D4
D4
D4
D4
D
P
P
P
P
P
V
V
V
V
V
L
L
L
L
L
4
H
H
H
H
H
4
4
4
4
4
4
V
V
V
V
V
D4
D4
D4
D4
D
P
P
P
P
P
V
V
V
V
V
4
4
4
4
4
4
4
4
C
C
C
C
C
4
4
D3
D3
D3
D3
D
M
M
M
M
M
4
V
V
V
V
V
3
C
C
C
C
C
D3
D3
D3
R
R
R
D3
D
R
R
D3
D3
D3
D3
D
P
P
P
P
P
3
3
3
3
3
V
V
V
V
V
L
L
L
L
L
3
H
H
H
H
H
3
3
3
3
3
3
V
V
V
V
V
D3
D3
D3
P
P
P
V
V
V
D3
D
P
P
V
V
3
3
3
3
3
C
C
C
C
C
3
3
3
3
3
3
D2
D2
D2
D2
D
M
M
M
M
M
V
V
V
V
V
2
D2
D2
D2
D
D2
R
R
R
R
R
D2
D2
D2
D2
D
P
P
P
P
P
C
C
C
C
C
2
2
2
2
2
L
L
L
L
L
H
H
H
H
H
V
V
V
V
V
2
2
V
V
V
V
V
D2
D2
D2
D2
D
P
P
P
P
P
V
V
V
V
V
2
2
2
2
2
2
2
2
2
2
C
C
C
C
C
2
2
2
2
2
2
V
V
V
V
V
D1
D1
D1
D1
D
M
M
M
M
M
D1
D1
D1
P
P
P
D1
D
P
P
1
1
1
1
1
D1
D1
D1
R
R
R
D1
D
R
R
1
C
C
C
C
C
H
H
H
H
H
1
L
L
L
L
L
1
V
V
V
V
V
D1
D1
D1
D1
D
P
P
P
P
P
V
V
V
V
V
V
V
V
V
V
1
1
1
1
1
C
C
C
1
1
1
C
C
1
1
1
1
1
1
1
1
AD1881A
V
V
V
V
V
D0
D0
D0
D0
D
M
M
M
M
M
D0
D0
D0
D0
D
P
P
P
P
P
0
0
0
0
0
D0
D0
D0
D
D0
R
R
R
R
R
H
H
H
H
H
0
C
C
C
C
C
0
L
L
L
L
L
0
D0
D0
D0
X X X X X
V
V
V
D0
D
V
V
V
V
V
V
V
V
V
V
V
V
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D
D
D
D
D
0 8 h
0 8 h
0 8 h
0 8
0 8
D
D
D
D
D
0 8 h
0 8 h
0 8 h
0 8
0 8
D
D
D
8 8 h
8 8 h
8 8
D
D
D
0 8 h
0 8 h
0 8
D
D
8 8 h
8 8
D
D
0 8 h
0 8
e
e
e
e
e
8 0
8 0
8 0
8 0
8 0
e
e
e
e
e
8 0
8 0
8 0
8 0
8 0
a f
a f
a f
a f
a f
e
e
e
e
e
e
e
e
e
e
a f
a f
a f
a f
a f
8 0
8 0
8 0
8 0
8 0
0 0
0 0
0 0
0 0
0 0
a f
a f
a f
a f
a f
a f
a f
a f
a f
a f
h
h
u
u
u
u
u
h
h
u
u
u
u
u
h
h
h
h
t l
t l
t l
t l
t l
u
u
u
u
u
u
u
u
u
u
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l