EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet - Page 9

• 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

Figure 11. Capacitance Input Error vs. Resistance Between CIN1(+) and SHLD;
Figure 12. Capacitance Input Error vs. Resistance Between CIN(+) and SHLD;
–1000
–1000
–100
–150
–100
–200
–300
–400
–500
–600
–700
–800
–900
–100
–200
–300
–400
–500
–600
–700
–800
–900
150
100
–50
100
50
Figure 10. Capacitance Input Error vs. Parallel Resistance;
0.091
0
0
0
0
0
25
0.27
CIN(+) to GND = 25 pF, V
CIN(+) to GND = 8 pF, V
CIN(+) to GND = 8 pF, V
50
CIN TO SHLD RESISTANCE (MΩ)
CIN TO SHLD RESISTANCE (kΩ)
PARALLEL RESISTANCE (MΩ)
0.48
10
75
0.96
100
DD
125
DD
DD
5
= 5 V
= 5 V
100
= 5 V
150
25
175
100
200
1k
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Figure 13. Capacitance Input Error vs. Resistance Between SHLD and GND;
–100
–0.2
–0.4
–0.6
–0.8
–1.0
–0.2
–0.4
–0.6
–10
–20
–30
–40
–50
–60
–70
–80
–90
0.8
0.6
0.4
0.2
Figure 15. Capacitance Input Power Supply Rejection (PSR);
1.0
0.2
10
0
0
0.01
0
Figure 14. Capacitance Input Error vs. Serial Resistance;
2.5
1
CIN(+) to GND = 8 pF and 25pF, V
3.0
CIN(+) to GND = 8 pF; V
0.1
SHLD TO GND RESISTANCE (MΩ)
CIN(+) to GND = 8 pF
SERIAL RESISTANCE (kΩ)
3.5
VDD (V)
1.0
4.0
10
DD
= 5 V
4.5
25 pF
DD
10.0
= 5 V
5.0
AD7747
8 pF
100
100
5.5