ad1881a Analog Devices, Inc., ad1881a Datasheet - Page 12

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

AD1881A
Reset (Index 00h)
Note: Writing any value to this register performs a register reset, which causes all registers to revert to their default values (except
74h, which forces the serial configuration). Reading this register returns the ID code of the part and a code for the type of 3D Stereo
Enhancement.
ID[9:0] Identify Capability. The ID decodes the capabilities of AD1881A based on the following:
SE[4:0] Stereo Enhancement. The 3D stereo enhancement identifies the Analog Devices 3D stereo enhancement.
Master Volume Registers (Index 02h)
RMV[5:0]
LMV[5:0]
MM
Master Volume Mono (Index 06h)
MMV[4:0]
MMM
R g
R g
R g
R g
R
N m
N m
N m
N m
N
2 0 h
2 0 h
2 0 h
2 0 h
2 0
R g
R g
R g
R g
R
N m
N m
N m
N m
N
6 0 h
6 0 h
6 0 h
6 0 h
6 0
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 0 h
0 0 h
0 0 h
0 0 h
0 0
e
e
e
e
e
u
u
u
e
e
e
e
e
u
u
u
u
u
u
u
e
e
e
e
e
u
u
u
u
u
h
h
h
g
g
m
m
g
m
N
N
N
N
N
M
M
M
M
M
V
V
V
V
V
N
N
N
M
M
M
M
M
M
N
N
M
M
M
M
N
N
N
N
N
R
R
R
R
R
a
a
a
o
o
o
o
o
a
a
a
a
a
a
a
a
a
a
a
a
s e
s e
s e
s e
s e
a
a
a
a
a
a
a
a
a
a
o
o
o
o
o
m
m
m
m
m
u l
u l
u l
u l
u l
m
m
m
m
m
m
m
m
t s
t s
t s
t s
t s
t s
t s
t s
m
m
t s
t s
n
n
n
n
n
t e
t e
t e
t e
t e
m
m
m
m
m
o
o
o
e
e
e
e
e
o
o
r e
r e
r e
r e
r e
e
e
e
e
e
r e
r e
r e
r e
r e
e
e
e
e
e
e
e
e
e
e
V
V
V
V
V
o
o
o
o
o
u l
u l
u l
u l
u l
D 5 1
D 5 1
D 5 1
D 5 1
D
MM
MM
MM
MM
M
D 5 1
D 5 1
D 5 1
D 5 1
D
X X X X X
m
m
m
m
m
Right Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from
0 dB to a maximum attenuation of –94.5 dB.
Left Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to
a maximum attenuation of –94.5 dB.
Master Volume Mute. When this bit is set to “1,” the channel is muted.
Mono Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from
0 dB to a maximum attenuation of –46.5 dB.
Mono Master Volume Mute. When this bit is set to “1,” the channel is muted.
5 1
M
5 1
e
e
e
e
e
D 5 1
D 5 1
D 5 1
M M
M M
M M
D 5 1
D
M M
M
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
5 1
D 4 1
D 4 1
D 4 1
S 4
S 4
S 4
M
M
M
M
M
D 4 1
D
S 4
S
E
E
E
E
E
4 1
4 1
M
4
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
L
L
L
L
L
Bit = 1
ID0
ID1
ID2
ID3
ID4
ID5
ID6
ID7
ID8
ID9
D 3 1
D 3 1
D 3 1
S 3
S 3
S 3
D 3 1
D
S 3
S
4 1
M
M
M
M
M
E
E
E
E
E
3 1
3 1
3
V
V
V
V
V
D 3 1
D 3 1
D 3 1
D 3 1
D
X X X X X
5
5
5
5
5
3 1
MM
0
0
0
1
D 2 1
D 2 1
D 2 1
D 2 1
D
L
L
L
L
L
D 2 1
D 2 1
D 2 1
S 2
S 2
S 2
D 2 1
D
S 2
S
M
M
M
M
M
E
E
E
E
E
2 1
2 1
2
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
L
L
L
L
L
D 1 1
D 1 1
D 1 1
S 1
S 1
S 1
D 1 1
D
S 1
S
M
M
M
M
M
E
E
E
E
E
1 1
1 1
D 1 1
D 1 1
D 1 1
D 1 1
D
X X X X X
1
V
V
V
V
V
Function
Dedicated MIC PCM In Channel
Modem Line Codec Support
Bass and Treble Control
Simulated Stereo (Mono to Stereo)
Headphone Out/True Line-Level Out
Loudness (Bass Boost) Support
18-Bit DAC Resolution
20-Bit DAC Resolution
18-Bit ADC Resolution
20-Bit ADC Resolution
1 1
3
3
3
3
3
xMV5 . . . xMV0
00 0000
01 1111
11 1111
xx xxxx
D 0 1
D 0 1
D 0 1
D 0 1
D
L
L
L
L
L
D 0 1
D 0 1
D 0 1
D 0 1
D
S 0
S 0
S 0
S 0
S
M
M
M
M
M
D 0 1
D 0 1
D 0 1
D 0 1
D
X X X X X
E
E
E
E
E
0 1
0 1
0 1
0
V
V
V
V
V
2
2
2
2
2
D9
D9
D9
D9
D
L
L
L
L
L
D9
D9
D9
X X X X X
D9
D9
D9
D9
D
I 9
I 9
I 9
I 9
I
D9
D
D
D
D
D
D
M
M
M
M
M
9
9
9
9
V
V
V
V
V
1
1
1
1
1
D8
D8
D8
D8
D
X X X X X
D8
D8
D8
D8
D
L
L
L
L
L
D8
D8
D8
D8
D
I 8
I 8
I 8
I 8
I
8
D
D
D
D
D
M
M
M
M
M
8
8
8
V
V
V
V
V
0
0
0
0
0
D7
D7
D7
D7
D
X X X X X
D7
D7
D7
D7
D
7
D7
D7
D7
D7
D
I 7
I 7
I 7
I 7
I
X X X X X
D
D
D
D
D
7
7
7
D6
D6
D6
D6
D
Function
0 dB Attenuation
–46.5 dB Attenuation
–94.5 dB Attenuation
–
X X X X X
∞
6
D6
D6
D6
D6
D
D6
D6
D6
D6
D
I 6
I 6
I 6
I 6
I
X X X X X
D
D
D
D
D
dB Attenuation
6
6
6
D5
D5
D5
D5
D
X X X X X
5
D5
D5
D5
R
R
R
D5
D
R
R
D5
D5
D5
D5
D
I 5
I 5
I 5
I 5
I
D
D
D
D
D
M
M
M
M
M
5
D4
D4
D4
D4
D
M
M
M
M
M
5
5
V
V
V
V
V
4
M
M
M
M
M
5
5
5
5
5
V
V
V
V
V
D4
D4
D4
R
R
R
D4
D
R
R
D4
D4
D4
D4
D
I 4
I 4
I 4
I 4
I
4
4
4
4
4
D
D
D
D
D
M
M
M
M
M
4
AD1881A
0
0
0
0
1
0
0
0
0
0
4
4
D3
D3
D3
D3
D
M
M
M
M
M
V
V
V
V
V
4
4
4
4
4
3
M
M
M
M
M
D3
D3
D3
D3
D
R
R
R
R
R
D3
D3
D3
D3
D
I 3
I 3
I 3
I 3
I
V
V
V
V
V
D
D
D
D
D
M
M
M
M
M
3
3
3
3
3
3
3
3
V
V
V
V
V
D2
D2
D2
D2
D
M
M
M
M
M
3
3
3
3
3
2
M
M
M
M
M
D2
D2
D2
D2
D
R
R
R
R
R
D2
D2
D2
D2
D
I 2
I 2
I 2
I 2
I
D
D
D
D
D
M
M
M
M
M
V
V
V
V
V
2
2
2
2
2
2
2
2
V
V
V
V
V
2
2
2
2
2
D1
D1
D1
M
M
M
D1
D
M
M
D1
D1
D1
D1
D
R
R
R
R
R
D1
D1
D1
D1
D
I 1
I 1
I 1
I 1
I
1
M
M
M
M
M
D
D
D
D
D
M
M
M
M
M
1
1
V
V
V
V
V
1
V
V
V
V
V
1
1
1
1
1
1
1
1
1
1
D0
D0
D0
D0
D
R
R
R
R
R
D0
D0
D0
D0
D
M
M
M
M
M
D0
D0
D0
D0
D
I 0
I 0
I 0
I 0
I
D
D
D
D
D
M
M
M
M
M
0
0
M
M
M
M
M
0
0
V
V
V
V
V
V
V
V
V
V
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
4 0 h
4 0 h
4 0 h
4 0
4 0
D
D
D
0 8 h
0 8 h
0 8
D
D
0 8 h
0 8
e
e
e
e
e
e
e
e
0 0
0 0
0 0
0 0
0 0
e
e
0 1
0 1
0 1
0 1
0 1
a f
a f
a f
a f
a f
e
e
e
e
e
a f
a f
a f
a f
a f
0 0
0 0
0 0
0 0
0 0
a f
a f
a f
h
h
a f
a f
u
u
u
u
u
h
h
u
u
u
u
u
h
h
t l
t l
t l
t l
t l
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