參數(shù)資料
型號(hào)： AD7712AR-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT SGNL CONDTNR 24SOIC
標(biāo)準(zhǔn)包裝： 400
位數(shù)： 24
采樣率（每秒）： 1.03k
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 45mW
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)單端，單極；1 個(gè)差分，單極；1 個(gè)差分，雙極
REV. F
AD7712
–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 and when writing to the register 24 bits of data must be written
otherwise the data will not be loaded to the control register. 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
X
BO
B/U
FS11
FS10
FS9
FS8
FS7
FS6
FS5
FS4
FS3
FS2
FS1
FS0
X = Don’t Care.
LSB
Operating Mode
MD2
MD1
MD0
Operating Mode
000
Normal Mode. This is the normal mode of operation of the device whereby a read to the device accesses
data from the data register. This is the default condition of these bits after the internal power-on reset.
001
Activate 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 registers 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 on VREF.
010
Activate 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.
011
Activate 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.
100
Activate 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.
101
Activate Background Calibration. This activates background calibration on the channel selected by CH. If
the background calibration mode is on, then the AD7712 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. Its major advantage is that
the user does not have to worry about recalibrating 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 monitored, and the calibration registers of the device are automatically updated.
110
Read/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, when writing to the calibration register, 24 bits of data must be written; otherwise the
new data will not be transferred to the calibration register.
111
Read/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, when writing to the calibration register, 24 bits of data must be written; otherwise the
new data will not be transferred to the calibration register.
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