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參數(shù)資料
| 型號： | EVAL-AD7731EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| 中文描述： | 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/44頁 |
| 文件大小： | 411K |
| 代理商： | EVAL-AD7731EB |
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AD7731
–12–
REV. 0
T able V. Summary of On-Chip Registers
Power-On/Reset
Default Value
Register Name
T ype
Size
Function
Communications
Register
Write Only
8 Bits
Not Applicable
All operations to other registers are initiated through
the Communications Register. T his controls whether
subsequent operations are read or write operations
and also selects the register for that subsequent opera-
tion. Most subsequent operations return control to
the Communications Register except for the continu-
ous read mode of operation.
Provides status information on conversions, calibra-
tions, settling to step inputs, standby operation and
the validity of the reference voltage.
Status Register
Read Only
8 Bits
CX Hex
Data Register
Read Only
16 Bits or 24 Bits
000000 Hex
Provides the most up-to-date conversion result from
the part. Register length can be programmed to be
16 bit or 24 bit.
Controls functions such as mode of operation, uni-
polar/bipolar operation, controlling the function of
AIN3/D1 and AIN4/D0, burnout current and Data
Register word length. It also contains the reference
selection bit, the range selection bits and the channel
selection bits.
Controls the amount of averaging in the first stage
filter, selects the fast step and skip modes and con-
trols the chopping modes on the part.
Mode Register
Read/Write
16 Bits
0174 Hex
Filter Register
Read/Write
16 Bits
2002 Hex
Offset Register
Read/Write
24 Bits
Contains a 24-bit word which is the offset calibration
coefficient for the part. T he contents of this register
are used to provide offset correction on the output
from the digital filter. T here are three Offset Regis-
ters on the part and these are associated with input
channel pairs as outlined in T able X III.
Contains a 24-bit word which is the gain calibration
coefficient for the part. T he contents of this register
are used to provide gain correction on the output
from the digital filter. T here are three Gain Registers
on the part and these are associated with input chan-
nel pairs as outlined in T able X III.
Controls the test modes of the part which are used
when testing the part.
T he user is advised not to
change the contents of this register.
Gain Register
Read/Write
24 Bits
T est Register
Read/Write
24 Bits
000000 Hex
N
E
W
O
R
E
Z
1
W
R
0
W
R
O
R
E
Z
2
S
R
1
S
R
0
S
R
Y
D
R
Y
D
T
S
Y
B
T
S
F
E
R
O
N
3
S
M
2
S
M
1
S
M
0
S
M
2
D
M
1
D
M
0
D
M
B
U
/
N
E
D
1
D
0
D
L
W
F
E
R
I
H
2
N
R
1
N
R
0
N
R
O
B
2
H
C
1
H
C
0
H
C
1
1
F
S
0
1
F
S
9
F
S
8
F
S
7
F
S
6
F
S
5
F
S
4
F
S
3
F
S
2
F
S
1
F
S
0
F
S
O
R
E
Z
P
H
C
P
I
K
S
T
S
A
F
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