EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet - Page 8

• Manufacturer Part Number: EVAL-AD7747EBZ
• Description: 24-Bit Capacitance-to-Digital Converter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7747EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Capacitance-to-Digital Converter
• Kit Application Type: Data Converter
• Silicon Core Number: AD7747
• Sensor Type: Touch, Capacitive
• Interface: I²C
• Voltage - Supply: 2.7 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: AD7747
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7747
TYPICAL PERFORMANCE CHARACTERISTICS
–1000
–2000
–3000
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
2000
1000
–20
–40
–60
–80
80
60
40
20
.20
.15
.10
.05 0
Figure 6. Capacitance Input Offset Drift vs. Temperature;
0
Figure 5. Capacitance Input Gain Drift vs. Temperature;
0
–8 –7 –6 –5 –4 –3
–50
–50
Figure 4. Capacitance Input Integral Nonlinearity;
–25
–25
V
DD
V
0
= 5 V, CIN(+) to GND = 8 pF
0
DD
V
DD
INPUT CAPACITANCE (pF)
= 5 V, CAPDAC = 0x3F
= 5 V, CIN(+) Open
TEMPERATURE (ºC)
TEMPERATURE (ºC)
–2
25
25
–1
0
50
50
1
2
75
75
GAIN TC ≈ –28ppm/ºC
3
100
100
4
5
125
125
6
7
150
150
8
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Figure 7. Capacitance Input Error vs. Capacitance Between SHLD and GND;
Figure 8. Capacitance Input Error vs. Capacitance Between SHLD and GND;
Figure 9. Capacitance Input Error vs. Capacitance Between CIN(+) and SHLD;
–10
–20
–30
–40
–50
–10
–20
–30
–40
–50
–10
–20
–30
–40
–50
10
10
10
0
0
0
0
0
0
CIN(+) to GND = 25 pF, V
CIN(+) to GND = 8 pF, V
CIN(+) to GND = 8 pF, V
50
50
50
100 150 200 250 300 350 400 450
100 150 200 250 300 350 400 450
100 150 200 250 300 350 400 450
2.7V
3.0V
3.3V
5.0V
2.7V
3.0V
3.3V
5.0V
2.7V
3.0V
3.3V
5.0V
CAPACITANCE SHLD TO GND (pF)
CAPACITANCE SHLD TO GND (pF)
CAPACITANCE CIN TO SHLD (pF)
DD
DD
DD
= 2.7 V, 3 V, 3.3 V, and 5 V
= 2.7 V, 3 V, 3.3 V, and 5V
= 2.7 V, 3 V, 3.3 V, and 5 V
500
500
500
550
550
550
600
600
600