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AD7747 Datenblatt(PDF) 9 Page - Analog Devices

Teilenummer AD7747
Bauteilbeschribung  24-Bit Capacitance-to-Digital Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7747 Datenblatt(HTML) 9 Page - Analog Devices

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AD7747
Rev. 0 | Page 8 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
80
–80
–8 –7 –6 –5 –4 –3
–1
–2
8
INPUT CAPACITANCE (pF)
60
40
20
0
–20
–40
–60
01
23
456
7
Figure 4. Capacitance Input Integral Nonlinearity;
VDD = 5 V, CAPDAC = 0x3F
2000
–3000
–50
150
TEMPERATURE (ºC)
1000
0
–1000
–2000
–25
0
25
50
75
100
125
GAIN TC ≈ –28ppm/ºC
Figure 5. Capacitance Input Gain Drift vs. Temperature;
VDD = 5 V, CIN(+) to GND = 8 pF
.20
–0.30
–50
150
TEMPERATURE (ºC)
–25
0
25
50
75
100
125
.15
.10
.050
–0.05
–0.10
–0.15
–0.20
–0.25
Figure 6. Capacitance Input Offset Drift vs. Temperature;
VDD = 5 V, CIN(+) Open
10
–50
0
600
500
CAPACITANCE SHLD TO GND (pF)
0
–20
–10
–30
–40
50
100 150 200 250 300 350 400 450
550
2.7V
3.0V
3.3V
5.0V
Figure 7. Capacitance Input Error vs. Capacitance Between SHLD and GND;
CIN(+) to GND = 8 pF, VDD = 2.7 V, 3 V, 3.3 V, and 5 V
10
–50
0
600
500
CAPACITANCE SHLD TO GND (pF)
0
–20
–10
–30
–40
50
100 150 200 250 300 350 400 450
550
2.7V
3.0V
3.3V
5.0V
Figure 8. Capacitance Input Error vs. Capacitance Between SHLD and GND;
CIN(+) to GND = 25 pF, VDD = 2.7 V, 3 V, 3.3 V, and 5 V
10
–50
0
600
500
CAPACITANCE CIN TO SHLD (pF)
0
–20
–10
–30
–40
50
100 150 200 250 300 350 400 450
550
2.7V
3.0V
3.3V
5.0V
Figure 9. Capacitance Input Error vs. Capacitance Between CIN(+) and SHLD;
CIN(+) to GND = 8 pF, VDD = 2.7 V, 3 V, 3.3 V, and 5V


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