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參數資料
| 型號： | AD7711AR |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 28/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT RTD I SOURCE 24SOIC |
| 標準包裝： | 1 |
| 位數： | 24 |
| 采樣率（每秒）： | 1.03k |
| 數據接口： | 串行 |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 52.5mW |
| 電壓電源： | 模擬和數字，雙 ± |
| 工作溫度： | -40°C ~ 80°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 W |
| 包裝： | 管件 |
| 輸入數目和類型： | 1 個單端，單極；1 個單端，雙極；1 個差分，單極；1 個差分，雙極 |
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2
REV.G
AD7711
–9–
CONTROL REGISTER (24 BITS)
A write to the device with the A0 input low writes data to the control register. A read to the device with the A0 input low accesses the
contents of the control register. The control register is 24 bits wide; 24 bits of data must be written to the registers or the data will not
be loaded. In other words, it is not possible to write just the first 12-bits of data into the control register. If more than 24 clock pulses
are provided before
TFS returns high, then all clock pulses after the 24th clock pulse are ignored. Similarly, a read operation from the
control register should access 24 bits of data.
MSB
MD2
MD1
MD0
G2
G1
G0
CH
PD
WL
RO
BO
B/U
FS11
FS10
FS9
FS8
FS7
FS6
FS5
FS4
FS3
FS2
FS1
FS0
LSB
Operating Mode
MD2
MD1
MD0
Operating Mode
00
0Normal Mode. This is the normal mode of operation where a read to the device with A0 high accesses
data from the data register. This is the default condition of these bits after the internal power-on reset.
00
1Activate Self-Calibration. This activates self-calibration on the channel selected by CH. This is a one-step
calibration sequence, and when complete, the part returns to normal mode (with MD2, MD1, MD0 of
the control register returning to 0, 0, 0). The
DRDY output indicates when this self-calibration is complete.
For this calibration type, the zero-scale calibration is done internally on shorted (zeroed) inputs, and the
full-scale calibration is done internally on VREF.
01
0Activate System Calibration. This activates system calibration on the channel selected by CH. This is a
two-step calibration sequence, with the zero-scale calibration done first on the selected input channel and
DRDY indicating when this zero-scale calibration is complete. The part returns to normal mode at the
end of this first step in the two-step sequence.
01
1Activate System Calibration. This is the second step of the system calibration sequence with full-scale
calibration being performed on the selected input channel. Once again,
DRDY indicates when the full-
scale calibration is complete. When this calibration is complete, the part returns to normal mode.
10
0Activate System Offset Calibration. This activates system offset calibration on the channel selected by
CH. This is a one-step calibration sequence and, when complete, the part returns to normal mode with
DRDY indicating when this system offset calibration is complete. For this calibration type, the zero-scale
calibration is done on the selected input channel, and the full-scale calibration is done internally on VREF.
10
1Activate Background Calibration. This activates background calibration on the channel selected by CH. If
the background calibration mode is on, the AD7711 provides continuous self-calibration of the
reference and shorted (zeroed) inputs. This calibration takes place as part of the conversion sequence,
extending the conversion time and reducing the word rate by a factor of 6. The major advantage is that
the user does not have to recalibrate the device when there is a change in the ambient temperature. In this
mode, the shorted (zeroed) inputs and VREF, as well as the analog input voltage, are continuously moni-
tored and the calibration registers of the device are automatically updated.
11
0Read/Write Zero-Scale Calibration Coefficients. A read to the device with A0 high accesses the contents
of the zero-scale calibration coefficients of the channel selected by CH. A write to the device with A0 high
writes data to the zero-scale calibration coefficients of the channel selected by CH. The word length for
reading and writing these coefficients is 24 bits, regardless of the status of the WL bit of the control
register. Therefore, 24 bits of data must be written to the calibration register or the new data will not be
transferred to the calibration register.
11
1Read/Write Full-Scale Calibration Coefficients. A read to the device with A0 high accesses the contents of
the full-scale calibration coefficients of the channel selected by CH. A write to the device with A0 high
writes data to the full-scale calibration coefficients of the channel selected by CH. The word length for
reading and writing these coefficients is 24 bits, regardless of the status of the WL bit of the control
register. Therefore, 24 bits of data must be written to the calibration register, or the new data will not be
transferred to the calibration register.
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| AD7711AR-REEL | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC 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 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7711AR-REEL7 | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC 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 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
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