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參數(shù)資料
| 型號(hào)： | AD7707EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 3 V/5 V 610 V Input Range 1 mW 3-Channel 16-Bit Sigma-Delta ADC(316.51 k) |
| 中文描述： | 3伏/ 5伏610 V輸入范圍1毫瓦3通道16位Σ-Δ模數(shù)轉(zhuǎn)換器（316.51十一） |
| 文件頁(yè)數(shù)： | 15/40頁(yè) |
| 文件大?。?/td> | 316K |
| 代理商： | AD7707EB |
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REV. A
AD7707
–15–
Setup Register (RS2, RS1, RS0 = 0, 0, 1); Power-On/Reset Status: 01Hex
The Setup Register is an eight-bit register from which data can either be read or to which data can be written. Table XI outlines the
bit designations for the Setup Register.
Table XI. Setup Register
MD1 (0)
MD0 (0)
G2 (0)
G1 (0)
G0 (0)
B
/U (0)
BUF (0)
FSYNC (1)
MD1
MD0
Operating Mode
0
0
Normal Mode: this is the normal mode of operation of the device whereby the device is performing normal
conversions.
Self-Calibration: this activates self-calibration on the channel selected by CH1 and CH0 of the Communica-
tions Register. This is a one-step calibration sequence and when complete the part returns to Normal Mode
with MD1 and MD0 returning to 0, 0. The
DRDY
output or bit goes high when calibration is initiated and
returns low when this self-calibration is complete and a new valid word is available in the data register. The
zero-scale calibration is performed at the selected gain on internally shorted (zeroed) inputs and the full-
scale calibration is performed at the selected gain on an internally-generated V
REF
/Selected Gain.
Zero-Scale System Calibration: this activates zero scale system calibration on the channel selected by CH1
and CH0 of the Communications Register. Calibration is performed at the selected gain on the input voltage
provided at the analog input during this calibration sequence. This input voltage should remain stable for
the duration of the calibration. The
DRDY
output or bit goes high when calibration is initiated and returns
low when this zero-scale calibration is complete and a new valid word is available in the data register. At the
end of the calibration, the part returns to Normal Mode with MD1 and MD0 returning to 0, 0.
Full-Scale System Calibration: this activates full-scale system calibration on the selected input channel.
Calibration is performed at the selected gain on the input voltage provided at the analog input during this
calibration sequence. This input voltage should remain stable for the duration of the calibration. Once again,
the
DRDY
output or bit goes high when calibration is initiated and returns low when this full-scale calibra-
tion is complete and a new valid word is available in the data register. At the end of the calibration, the part
returns to Normal Mode with MD1 and MD0 returning to 0, 0.
0
1
1
0
1
1
G2–G0
Gain Selection Bits. These bits select the gain setting for the on-chip PGA as outlined in Table XII.
Table XII. Gain Selection
G2
G1
G0
Gain Setting
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
2
4
8
16
32
64
128
B
/U
BUF
Bipolar
/Unipolar Operation. A “0” in this bit selects
Bipolar
Operation. A “1” in this bit selects Unipolar Operation.
Buffer Control. With this bit at “0,” the on-chip buffer on the analog input is shorted out. With the buffer shorted
out, the current flowing in the V
DD
line is reduced. When this bit is high, the on-chip buffer is in series with the
analog input allowing the input to handle higher source impedances.
Filter Synchronization. When this bit is high, the nodes of the digital filter, the filter control logic and the calibra-
tion control logic are held in a reset state and the analog modulator is also held in its reset state. When this bit goes
low, the modulator and filter start to process data and a valid word is available in 3
×
1/ (output update rate), i.e.,
the settling time of the filter. This FSYNC bit does not affect the digital interface and does not reset the
DRDY
output if it is low.
FSYNC
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