參數(shù)資料
型號(hào)： AD7711A
廠商： Analog Devices, Inc.
英文描述： Signal Conditioning ADC with RTD Current Source(帶RTD電流源信號(hào)調(diào)節(jié)A/D轉(zhuǎn)換器)
中文描述： 信號(hào)調(diào)理ADC，具有電阻電流源（帶電阻電流源信號(hào)調(diào)節(jié)的A / D轉(zhuǎn)換器）
文件頁(yè)數(shù)： 9/27頁(yè)
文件大?。?/td> 237K
代理商： AD7711A
2
AD7711A
–9–
REV. C
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
IO
BO
B/U
FS11*
FS10
FS9
FS8
FS7
FS6
FS5
FS4
FS3
FS2
FS1
FS0
LSB
*Must always be 0 to ensure correct operation of the device.
Operating Mode
MD2
MD1
MD0
Operating Mode
0
0
0
Normal Mode. This is the normal mode of operation of the device whereby 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.
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 register returning to 0, 0, 0). The
DRDY
output indicates when this self-calibration is complete
and valid data is available in the output register. For this calibration type, the zero scale calibration is done
internally on shorted (zeroed) inputs and the full-scale calibration is done internally on V
REF
.
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.
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.
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 V
REF
.
Activate Background Calibration. This activates background calibration on the channel selected by CH. If
the background calibration mode is on, then the AD7711A 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 six. 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 V
REF
, as well as the analog input voltage, are
continuously monitored and the calibration registers of the device are automatically updated.
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.
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.
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
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