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AD7745ARUZ датащи(PDF) 11 Page - Analog Devices

номер детали AD7745ARUZ
подробное описание детали  24-Bit Capacitance-to-Digital Converter with Temperature Sensor
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD7745ARUZ датащи(HTML) 11 Page - Analog Devices

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AD7745/AD7746
Rev. 0| Page 11 of 28
OUTPUT NOISE AND RESOLUTION SPECIFICATIONS
The AD7745/AD7746 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 32 kHz, ±VDD/2, and with all CIN and EXC pins
connected only to the evaluation board (no external capacitors.)
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.
Table 5. Typical Capacitive Input Noise and Resolution vs. Conversion Time
Conversion
Time (ms)
Output Data
Rate (Hz)
–3dB Frequency
(Hz)
RMS Noise
(aF/√Hz)
RMS
Noise (aF)
P-P
Noise (aF)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
11.0
90.9
87.2
4.3
40.0
212.4
17.6
15.2
11.9
83.8
79.0
3.1
27.3
137.7
18.2
15.9
20.0
50.0
43.6
1.8
12.2
82.5
19.4
16.6
38.0
26.3
21.8
1.6
7.3
50.3
20.1
17.3
62.0
16.1
13.8
1.5
5.4
33.7
20.5
17.9
77.0
13.0
10.5
1.5
4.9
28.3
20.7
18.1
92.0
10.9
8.9
1.5
4.4
27.8
20.8
18.2
109.6
9.1
8.0
1.5
4.2
27.3
20.9
18.2
Table 6. Typical Voltage Input Noise and Resolution vs. Conversion Time, Internal Voltage Reference
Conversion
Time (ms)
Output Data
Rate (Hz)
–3dB Frequency
(Hz)
RMS Noise
(µV)
P-P Noise
(µV)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
20.1
49.8
26.4
11.4
62
17.6
15.2
32.1
31.2
15.9
7.1
42
18.3
15.7
62.1
16.1
8.0
4.0
28
19.1
16.3
122.1
8.2
4.0
3.0
20
19.5
16.8
Table 7. Typical Voltage Input Noise and Resolution vs. Conversion Time, External 2.5 V Voltage Reference
Conversion
Time (ms)
Output Data
Rate (Hz)
–3dB Frequency
(Hz)
RMS Noise
(µV)
P-P Noise
(µV)
Effective Resolution
(Bits)
P-P Resolution
(Bits)
20.1
49.8
26.4
14.9
95
18.3
15.6
32.1
31.2
15.9
6.3
42
19.6
16.8
62.1
16.1
8.0
3.3
22
20.5
17.7
122.1
8.2
4.0
2.1
15
21.1
18.3


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