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| 型号： | AD7731BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT SIGMA-DELTA 24-SOIC |
| 标准包装： | 1,000 |
| 位数： | 24 |
| 采样率（每秒）： | 6.4k |
| 数据接口： | DSP，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 125mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 3 个差分，单极；3 个差分，双极；5 个伪差分，单极；5 个伪差分，双极 |
| 配用： | EVAL-AD7731EBZ-ND - BOARD EVALUATION FOR AD7731 |
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AD7731
–12–
REV. 0
Table V. Summary of On-Chip Registers
Power-On/Reset
Register Name
Type
Size
Default Value
Function
Communications
Write Only
8 Bits
Not Applicable
All operations to other registers are initiated through
Register
the Communications Register. This 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.
Status Register
Read Only
8 Bits
CX Hex
Provides status information on conversions, calibra-
tions, settling to step inputs, standby operation and
the validity of the reference voltage.
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.
Mode Register
Read/Write
16 Bits
0174 Hex
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.
Filter Register
Read/Write
16 Bits
2002 Hex
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.
Offset Register
Read/Write
24 Bits
Contains a 24-bit word which is the offset calibration
coefficient for the part. The contents of this register
are used to provide offset correction on the output
from the digital filter. There are three Offset Regis-
ters on the part and these are associated with input
channel pairs as outlined in Table XIII.
Gain Register
Read/Write
24 Bits
Contains a 24-bit word which is the gain calibration
coefficient for the part. The contents of this register
are used to provide gain correction on the output
from the digital filter. There are three Gain Registers
on the part and these are associated with input chan-
nel pairs as outlined in Table XIII.
Test Register
Read/Write
24 Bits
000000 Hex
Controls the test modes of the part which are used
when testing the part. The user is advised not to
change the contents of this register.
N
E
W
O
R
E
Z1
W
R0
W
RO
R
E
Z2
S
R1
S
R0
S
R
Y
D
RY
D
T
S
Y
B
T
SF
E
R
O
N3
S
M2
S
M1
S
M0
S
M
2
D
M1
D
M0
D
M
B U
/
N
E
D1
D0
DL
W
F
E
R
I
H2
N
R1
N
R0
N
RO
B2
H
C1
H
C0
H
C
1
F
S0
1
F
S9
F
S8
F
S7
F
S6
F
S5
F
S4
F
S
3
F
S2
F
S1
F
S0
F
SO
R
E
ZP
H
CP
I
K
ST
S
A
F
REV. A
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