ad1881a Analog Devices, Inc., ad1881a Datasheet - Page 16

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

AD1881A
General Purpose Register (Index 20h)
Note: This register should be read before writing to generate a mask for only the bit(s) that need to be changed. The function
default value is 0000h which is all off.
LPBK
MS
MIX
3D
POP
3D Control Register (Index 22h)
DP[2:0]
2 2 h
2 2 h
2 2 h
R g
R g
R g
R g
R
N m
N m
N m
N m
N
0 2 h
0 2 h
0 2 h
0 2 h
0 2
R g
R g
R g
R g
R
N m
N m
N m
N m
N
2 2 h
2 2
e
e
e
e
e
u
u
u
u
u
e
e
e
e
e
u
u
u
u
u
h
h
g
g
m
m
N
N
N
G
G
G
N
N
N
3
3
3
N
N
G
G
N
N
3
3
D
D
D
D
D
a
a
a
a
a
e
e
e
a
a
a
a
a
e
e
m
m
m
m
m
n
n
n
n
n
m
m
m
m
m
C
C
C
C
C
r e
r e
r e
r e
r e
e
e
e
e
e
e
e
e
e
e
o
o
o
o
o
l a
l a
l a
l a
l a
n
n
n
n
n
r t
r t
r t
r t
r t
P
P
P
P
P
l o
l o
l o
l o
l o
u
u
u
u
u
r
r
r
r
r
p
p
p
p
p
Loopback Control. ADC/DAC Digital Loopback Mode
MIC Select
Mono Output Select
3D PHAT Stereo Enhancement
PCM Output Path and Mute. The POP bit controls the optional PCM out 3D bypass path (the pre- and post-3D
PCM out paths are mutually exclusive).
Depth Control. Sets 3D “Depth” PHAT Stereo enhancement according to table below.
o
o
o
o
o
e s
e s
e s
e s
e s
0 = MIC1.
1 = MIC2.
0 = Mix.
1 = MIC.
0 = PHAT Stereo is off.
1 = PHAT Stereo is on.
0 = pre-3D.
1 = post-3D.
D 5 1
D 5 1
D 5 1
D 5 1
D
X X X X X
5 1
D 5 1
D 5 1
D 5 1
D 5 1
D
P P
P P
P P
P P
P
O
O
O
O
O
5 1
P
D 4 1
D 4 1
D 4 1
D 4 1
D
X X X X X
4 1
D 4 1
D 4 1
D 4 1
X X X X X
D 4 1
D
4 1
D 3 1
D 3 1
D 3 1
D 3 1
D
X X X X X
3 1
D 3 1
D 3 1
D 3 1
D 3 1
D
3D
3D
3D
3D
3
D
3 1
D 2 1
D 2 1
D 2 1
D 2 1
D
X X X X X
2 1
D 2 1
D 2 1
D 2 1
D 2 1
D
X X X X X
DP3 . . . DP0
0000
0001
.
.
1110
1111
2 1
D 1 1
D 1 1
D 1 1
X X X X X
D 1 1
D
1 1
D 1 1
D 1 1
D 1 1
X X X X X
D 1 1
D
1 1
D 0 1
D 0 1
D 0 1
D 0 1
D
X X X X X
0 1
D 0 1
D 0 1
D 0 1
D 0 1
D
X X X X X
D9
D9
D9
D9
D
X X X X X
0 1
9
D9
D9
D9
D9
D
M X
M X
M X
M X
M
D8
D8
D8
D8
D
X X X X X
9
I
I
I
I
I
8
X
D8
D8
D8
D8
D
MS
MS
MS
MS
M
D7
D7
D7
D7
D
X X X X X
8
S
7
Depth
0%
6.67%
.
.
93.33%
100%
D6
D6
D6
X X X X X
D7
D7
D7
L
L
L
D6
D
D7
D
L
L
P
P
P
P
P
6
7
B
B
B
B
B
K
K
K
K
K
D5
D5
D5
D5
D
X X X X X
D6
D6
D6
D6
D
X X X X X
5
6
D4
D4
D4
D4
D
X X X X X
D5
D5
D5
D5
D
X X X X X
4
5
D3
D3
D3
D3
D
D 3
D 3
D 3
D 3
D
D4
D4
D4
D4
D
X X X X X
P
P
P
3
P
P
4
3
D3
D3
D3
D3
D
X X X X X
D2
D2
D2
D 2
D 2
D 2
D2
D
D 2
D
3
2
P
P
P
P
P
2
D2
D2
D2
D2
D
X X X X X
2
D1
D1
D1
D1
D
D 1
D 1
D 1
D 1
D
1
P
P
P
P
P
1
D1
D1
D1
X X X X X
D1
D
1
D0
D0
D0
D0
D
D 0
D 0
D 0
D 0
D
P
P
P
0
P
P
D0
D0
D0
X X X X X
D0
D
0
0
D
D
D
D
D
0 0 h
0 0 h
0 0 h
0 0
0 0
D
D
D
0 0 h
0 0 h
0 0
D
D
0 0 h
0 0
e
e
e
e
e
0 0
0 0
0 0
0 0
0 0
a f
a f
a f
a f
a f
e
e
e
e
e
0 0
0 0
0 0
0 0
0 0
a f
a f
a f
a f
a f
h
h
u
u
u
u
u
h
h
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