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參數(shù)資料
| 型號： | AD7747 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| 中文描述： | 24位的電容數(shù)字轉(zhuǎn)換器的溫度傳感器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AD7747 |
Preliminary Technical Data
AD7747
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
The AD7747 resolution is limited by noise. The noise
performance varies with the selected conversion time.
Table 5 shows typical noise performance and resolution for the
capacitive channel. These numbers were generated from 1000
data samples acquired in continuous conversion mode, at an
excitation of 16 kHz, ±V
DD
/2, and with all CIN and EXC pins
connected only to the evaluation board (no external capacitors.)
Table 5. Typical Capacitive Input Noise and Resolution vs. Conversion Time
Conversion
Time (ms)
Rate (Hz)
(Hz)
22.0
45.5
23.9
41.9
TBD
40.0
25.0
76.0
13.2
124.0
8.1
6.9
154.0
6.5
184.0
5.4
219.3
4.6
Rev. PrC| Page 9 of 20
Table 6 and Table 7 show typical noise performance and
resolution for the voltage channel. These numbers were
generated from 1000 data samples acquired in continuous
conversion mode with VIN pins shorted to ground.
RMS noise represents the standard deviation and p-p noise
represents the difference between minimum and maximum
results in the data. Effective resolution is calculated from rms
noise, and p-p resolution is calculated from p-p noise.
Output Data
–3dB Frequency
RMS Noise
(aF/√Hz)
TBD
15
RMS
Noise
(aF)
TBD
40
P-P
Noise
(aF)
TBD
250
Effective
Resolution
(Bits)
TBD
18.5
P-P Resolution
(Bits)
TBD
16.0
Table 6. Typical Voltage Input Noise and Resolution vs. Conversion Time, Internal Voltage Reference
Conversion
Time (ms)
Rate (Hz)
(Hz)
20.1
49.8
26.4
32.1
31.2
15.9
62.1
16.1
8.0
122.1
8.2
4.0
Output Data
–3dB Frequency
RMS Noise
(μV)
11.4
7.1
4.0
3.0
P-P Noise
(μV)
62
42
28
20
Effective
Resolution
(Bits)
17.6
18.3
19.1
19.5
P-P Resolution
(Bits)
15.2
15.7
16.3
16.8
Table 7. Typical Voltage Input Noise and Resolution vs. Conversion Time, External 2.5 V Voltage Reference
Conversion
Time (ms)
Rate (Hz)
(Hz)
(μV)
20.1
49.8
26.4
14.9
32.1
31.2
15.9
6.3
62.1
16.1
8.0
3.3
122.1
8.2
4.0
2.1
Output Data
–3dB Frequency
RMS Noise
P-P Noise
(μV)
95
42
22
15
Effective Resolution
(Bits)
18.3
19.6
20.5
21.1
P-P Resolution
(Bits)
15.6
16.8
17.7
18.3
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