ad1881a Analog Devices, Inc., ad1881a Datasheet - Page 20

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

AD1881A
Sample Rate 1 (Index 7Ah)
Note: 2Ch is an alias for 7Ah. The VRA bit in register 2Ah must be set for the alias to work; if a zero is written to VRA, both sample
rates are reset to 48k.
SR1[15:0]
Vendor ID Registers (Index 7Ch–7Eh)
S[7:0]
F[7:0]
T[7:0]
REV[7:0]
These bits are read-only and should be verified before accessing vendor defined features.
AD1881A/AD1881 USER VISIBLE DIFFERENCES
• Pin 48 is now MODE pin, no longer CHAIN_CLK.
• AD1881 chaining mode not supported.
• LSB of register 7Eh is 48h instead of 40h.
R g
R g
R g
R g
R
N m
N m
N m
N m
N
7 h
7 h
7 h
7 h
7
R g
R g
R g
R g
R
N m
N m
N m
N m
N
7 h
7 h
7 h
7 h
7
R g
R g
R g
R g
R
N m
N m
N m
N m
N
7 h
7 h
7 h
7 h
7
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
g
h
m
g
g
h
h
m
m
N
N
N
N
N
S
S
S
S
S
N
N
N
N
N
V
V
V
V
V
N
N
N
N
N
V
V
V
V
V
a
a
a
a
a
a
a
a
a
a
e
e
e
e
e
a
a
a
a
a
e
e
e
a
a
a
a
a
e
e
m
m
m
m
m
m
m
m
n
n
n
m
m
n
n
m
m
m
m
m
n
n
n
n
n
m
m
m
m
m
d
d
d
d
d
p
p
p
d
d
d
d
d
p
p
e
e
e
e
e
e
e
e
e
e
o
o
o
o
o
e
e
e
e
e
o
o
o
e l
e l
e l
e l
e l
o
o
r
r
r
r
r
r
r
r
r
r
R
R
R
R
R
I
I
I
I
I
I
I
I
I
I
D
D
D
D
D
D
D
D
D
D
a
a
a
a
a
e t
e t
e t
e t
e t
1
1
1
1
1
2
2
2
2
2
Writing to this register allows the user to program the sampling frequency from 7 kHz (1B58h) to 48 kHz (BB80h)
in 1 Hertz increments. Programming a value greater than 48 kHz or less than 7 kHz may cause unpredictable
results.
This register is ASCII encoded to “A.”
This register is ASCII encoded to “D.”
This register is ASCII encoded to “S.”
Revision Register field.
1
1
1
1
1
D 5 1
D 5 1
D 5 1
T7
T7
T7
D 5 1
D
T7
T
D 5 1
D 5 1
D 5 1
S
S
S
D 5 1
D
S
S
7
5 1
R
R
R
R
R
5 1
D 5 1
D 5 1
D 5 1
F7
F7
F7
D 5 1
D
F7
F
1
1
1
1
1
7
5 1
5 1
5 1
5 1
5 1
5 1
D 4 1
D 4 1
D 4 1
T6
T6
T6
D 4 1
D
T6
T
6
4 1
D 4 1
D 4 1
D 4 1
D 4 1
D
S
S
S
S
S
R
R
R
R
R
4 1
D 4 1
D 4 1
D 4 1
D 4 1
D
F6
F6
F6
F6
F
1
1
1
1
1
6
4 1
4 1
4 1
4 1
4 1
4 1
D 3 1
D 3 1
D 3 1
T5
T5
T5
D 3 1
D
T5
T
5
3 1
D 3 1
D 3 1
D 3 1
D 3 1
D
S
S
S
S
S
R
R
R
R
R
D 3 1
D 3 1
D 3 1
D 3 1
D
F5
F5
F5
F5
F
3 1
5
1
1
1
1
1
3 1
D 2 1
D 2 1
D 2 1
T4
T4
T4
D 2 1
D
T4
T
3 1
3 1
3 1
3 1
3 1
4
2 1
D 2 1
D 2 1
D 2 1
S
S
S
D 2 1
D
S
S
D 2 1
D 2 1
D 2 1
D 2 1
D
F4
F4
F4
F4
F
R
R
R
R
R
2 1
4
2 1
D 1 1
D 1 1
D 1 1
D 1 1
D
T3
T3
T3
T
T3
1
1
1
1
1
2 1
2 1
2 1
2 1
2 1
3
1 1
D 1 1
D 1 1
D 1 1
D 1 1
D
S
S
S
S
S
D 1 1
D 1 1
D 1 1
D 1 1
D
F3
F3
F3
F3
F
R
R
R
R
R
1 1
3
D 0 1
D 0 1
D 0 1
D 0 1
D
T2
T2
T2
T
T2
1 1
1
1
1
1
1
2
0 1
1 1
1 1
1 1
1 1
1 1
D 0 1
D 0 1
D 0 1
F2
F2
F2
D 0 1
D 0 1
D 0 1
D 0 1
D
S
S
S
S
S
D 0 1
D
F2
F
D9
D9
D9
D9
D
T1
T1
T1
T
T1
R
R
R
R
R
2
0 1
0 1
1
9
1
1
1
1
1
0 1
0 1
0 1
0 1
0 1
D9
D9
D9
D9
D
F1
F1
F1
F1
F
D8
D8
D8
D8
D
T0
T0
T0
T
T0
D9
D9
D9
D9
D
S
S
S
S
S
1
0
R
R
R
9
8
R
R
9
9 1
9 1
9 1
9 1
9 1
D7
D7
D7
D7
D
R
R
R
R
R
D8
D8
D8
D8
D
F0
F0
F0
F0
F
E
E
E
E
E
D8
D8
D8
D8
D
S
S
S
S
S
7
0
8
V
V
V
V
V
R
R
R
R
R
8
7
7
7
7
7
8 1
8 1
8 1
8 1
8 1
D7
D7
D7
D7
D
S7
S7
S7
S7
S
D6
D6
D6
D6
D
R
R
R
R
R
D7
D7
D7
S
S
S
7
D7
D
S
S
7
E
E
E
E
E
6
R
R
R
R
R
7
V
V
V
V
V
7 1
7 1
7 1
7 1
7 1
6
6
6
6
6
D6
D6
D6
D6
D
S6
S6
S6
S6
S
6
6
D5
D5
D5
R
R
R
D6
D6
D6
D6
D
S
S
S
S
S
D5
D
R
R
R
R
R
R
R
E
E
E
E
E
6
5
6 1
6 1
6 1
6 1
6 1
V
V
V
V
V
5
5
5
D5
D5
D5
S5
S5
S5
5
5
D5
D
S5
S
5
5
D5
D5
D5
D5
D
S
S
S
S
S
D4
D4
D4
D4
D
R
R
R
R
R
R
R
R
R
R
5
E
E
E
E
E
4
5 1
5 1
5 1
5 1
5 1
V
V
V
V
V
D4
D4
D4
D4
D
S4
S4
S4
S4
S
4
4
4
4
4
4
4
D4
D4
D4
S
S
S
D4
D
S
S
R
R
R
R
R
4
D3
D3
D3
D3
D
R
R
R
R
R
4 1
4 1
4 1
4 1
4 1
E
E
E
E
E
3
D3
D3
D3
D3
D
S3
S3
S3
S3
S
V
V
V
V
V
3
3
3
3
3
3
3
D3
D3
D3
D3
D
S
S
S
S
S
R
R
R
R
R
3
D2
D2
D2
D2
D
R
R
R
R
R
3 1
3 1
3 1
3 1
3 1
D2
D2
D2
D2
D
S2
S2
S2
S2
S
E
E
E
E
E
2
2
2
V
V
V
V
V
D2
D2
D2
D2
D
S
S
S
S
S
2
2
2
2
2
R
R
R
R
R
2
2 1
2 1
2 1
2 1
2 1
D1
D1
D1
R
R
R
D1
D
R
R
D1
D1
D1
S1
S1
S1
D1
D
S1
S
E
E
E
E
E
1
1
1
V
V
V
V
V
D1
D1
D1
D1
D
S
S
S
S
S
1
1
1
1
1
R
R
R
R
R
1
1 1
1 1
1 1
1 1
1 1
D0
D0
D0
D0
D
S0
S0
S0
S0
S
D0
D0
D0
D0
D
R
R
R
R
R
0
E
E
E
E
E
0
0
D0
D0
D0
D0
D
S
S
S
S
S
V
V
V
V
V
R
R
R
R
R
0
0
0
0
0
0
0 1
0 1
0 1
0 1
0 1
D
D
D
D
D
1 4 h
1 4 h
1 4 h
1 4
1 4
D
D
D
D
D
3 5 h
3 5 h
3 5 h
3 5
3 5
e
e
e
e
e
4 4
4 4
4 4
4 4
4 4
D
D
D
D
D
B
B
B
B
B
e
e
e
e
e
a f
a f
a f
8 4
8 4
8 4
8 4
8 4
a f
a f
a f
a f
a f
a f
a f
B
B
B
B
B
e
e
e
e
e
h
h
u
u
u
u
u
h
h
a f
a f
a f
a f
a f
u
u
u
0 8
0 8
0 8
0 8
0 8
u
u
t l
t l
t l
t l
t l
t l
t l
t l
t l
t l
u
u
u
u
u
h
h
h
h
h
t l
t l
t l
t l
t l