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參數資料
| 型號： | AD7731 |
| 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模數轉換器 |
| 文件頁數： | 15/44頁 |
| 文件大小： | 411K |
| 代理商： | AD7731 |
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AD7731
–15–
REV. 0
Data Register (RS2-RS0 = 0, 0, 1); Power On/Reset Status: 000000 Hex
T he Data Register on the part is a read-only register that contains the most up-to-date conversion result from the AD7731. Figure 5
shows a flowchart for reading from the registers on the AD7731. T he register can be programmed to be either 16 or 24 bits wide,
determined by the status of the WL bit of the Mode Register. T he
RDY
output and
RDY
bit of the Status Register are set low when
the Data Register is updated. T he
RDY
pin and
RDY
bit will return high once the full contents of the register (either 16 or 24 bits)
have been read. If the Data Register has not been read by the time the next output update occurs, the
RDY
pin and
RDY
bit will go
high for at least 158.5
×
t
CLK IN
indicating when a read from the Data Register should not be initiated to avoid a transfer from the
Data Register as it is being updated. Once the updating of the Data Register has taken place,
RDY
returns low.
If the Communications Register data sets up the part for a write operation to this register, a write operation must actually take place
in order to return the part to where it is expecting a write operation to the Communications Register (the default state of the inter-
face). However, the 16 or 24 bits of data written to the part will be ignored by the AD7731.
Mode Register (RS2-RS0 = 0, 1, 0); Power-On/Reset Status: 0174 Hex
T he Mode Register is a 16-bit register from which data can either be read or to which data can be written. T his register configures
the operating modes of the AD7731, the input range selection, the channel selection and the word length of the Data Register. T ableX
outlines the bit designations for the Mode Register. MR0 through MR15 indicate the bit location, MR denoting the bits are in the
Mode Register. MR15 denotes the first bit of the data stream. T he number in brackets indicates the power-on/reset default status of
that bit. Figure 5 shows a flowchart for reading from the registers on the AD7731 and Figure 6 shows a flowchart for writing to the
registers on the part.
T able X . Mode Register
5
1
R
M
4
1
R
M
3
1
R
M
2
1
R
M
1
1
R
M
0
1
R
M
9
R
M
8
R
M
)
(
2
D
M
)
(
1
D
M
)
(
0
D
M
B
)
(
U
/
)
(
N
E
D
)
(
1
D
)
(
0
D
)
(
L
W
7
R
M
6
R
M
5
R
M
4
R
M
3
R
M
2
R
M
1
R
M
0
R
M
)
(
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
Bit
Location
Bit
Mnemonic
Description
MR15–MR13
MD2–MD0
Mode Bits. T hese three bits determine the mode of operation of the AD7731 as outlined in
T able X I. T he modes are independent, such that writing new mode bits to the Mode Regis-
ter will exit the part from the mode in which it is operating and place it in the new requested
mode immediately after the Mode Register write. T he function of the mode bits is described
in more detail below.
T able X I. Operating Modes
MD2
MD1
MD0
Mode of Operation
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Sync (Idle) Mode
Continuous Conversion Mode
Single Conversion Mode
Power-Down (Standby) Mode
Internal Zero-Scale Calibration
Internal Full-Scale Calibration
System Zero-Scale Calibration
System Full-Scale Calibration
Power-On/Reset Default
相關PDF資料 |
PDF描述 |
|---|---|
| AD7731BN | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| AD7731BR | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| AD7731BRU | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| AD7731EB | Precision, Zero-Drift Instrumentation Amplifier; Package: SO; No of Pins: 16; Temperature Range: 0°C to +70°C |
| AD7732 | 2-Channel, +-10 V Input Range, High Throughput, 24-Bit SIGMA- ADC |
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| AD7731BN | 功能描述:IC ADC 24BIT SIGMA-DELTA 24-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數:12 采樣率（每秒）:3M 數據接口:- 轉換器數目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數目和類型:- |
| AD7731BNZ | 功能描述:IC ADC 24BIT SIGMA-DELTA 24DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7731BR | 功能描述:IC ADC 24BIT 24-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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