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| 型号： | AD7715ARUZ-3 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/40页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SIGMA-DELTA 16TSSOP |
| 标准包装： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 500 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 9.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，单极；1 个差分，双极 |
| 配用： | EVAL-AD7715-3EBZ-ND - BOARD EVALUATION FOR AD7715 |
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AD7715
Rev. D | Page 15 of 40
Table 13.
MD1
MD0
Operating Mode
0
Normal mode. This operating mode is the default mode of operation of the device whereby the device is performing normal
conversions. The AD7705 is placed in this mode after power-on or reset.
0
1
Self-calibration. 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 DRDYbit 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 VREF/selected gain.
1
0
Zero-scale system calibration. Zero-scale system 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 DRDY 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.
1
Full-scale system calibration. Full-scale system 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 DRDY bit goes high when calibration is initiated and returns low when this full-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.
Table 14. Output Update Rates
FS1
FS0
Output Update Rate
3 dB Filter Cutoff
0
20 Hz
5.24 Hz
0
1
25 Hz
6.55 Hz
0
1
0
100 Hz
26.2 Hz
0
1
200 Hz
52.4 Hz
1
0
50 Hz
13.1 Hz
1
0
1
60 Hz
15.7 Hz (default status)
1
0
250 Hz
65.5 Hz
1
500 Hz
131 Hz
1 Assumes correct clock frequency at MCLK IN pin.
TEST REGISTER (RS1, RS0 = 1, 0)
The part contains a test register, which is used in testing the
device. The user is advised not to change the status of any of the
bits in this register from the default (power-on or reset) status
of all 0s as the part will be placed in one of its test modes and
will not operate correctly. If the part enters one of its test modes,
exercising RESET will exit the part from the mode. An alterna-
tive scheme for getting the part out of one of its test modes, is to
reset the interface by writing 32 successive 1s to the part and
then load all 0s to the test register.
DATA REGISTER (RS1, RS0 = 1, 1)
The data register on the part is a read-only 16-bit register
that contains the most up-to-date conversion result from the
AD7715. If the communications register data sets up the part
for a write operation to this register, a write operation must
actually take place to return the part to where it is expecting
a write operation to the communications register (the default
state of the interface). However, the 16 bits of data written to
the part will be ignored by the AD7715.
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