AD7143 Analog Devices, AD7143 Datasheet - Page 9

• Manufacturer Part Number: AD7143
• Description: Programmable Controller for Capacitance Touch Sensors
• Manufacturer: Analog Devices

Specifications of AD7143

• Resolution (bits): 16bit
• # Chan: 8
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: n/a
• Ain Range: ± 2 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

12
10
4.8
4.3
3.8
3.3
2.8
2.3
1.8
1.3
960
940
920
900
880
860
840
820
800
780
8
6
4
2
0
–40
–40
Figure 11. Shutdown Supply Current vs. Temperature
0
Figure 10. Supply Current vs. Temperature
–20
–20
10k
0
Figure 12. 3.3 V Linearity
0
20k
TEMPERATURE (°C)
CDC OUTPUT CODE
CDC OUTPUT CODE
20
TEMPERATURE (°C)
20
30k
40
40
40k
60
60
3.3V
3.6V
3.3V
2.7V
3.6V
80
50k
80
2.7V
100
100
60k
120
120
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–0.005
–0.010
0.020
0.015
0.010
0.005
180
160
140
120
100
2.5
2.0
1.5
1.0
0.5
80
60
40
20
0
0
0
100
10
0
Figure 15. Power Supply Square Wave Rejection
Figure 14. Power Supply Sine Wave Rejection
10k
Figure 13. 3.3 V Linearity Error
1k
SQUARE WAVE FREQUENCY (Hz)
20k
CDC OUTPUT CODE
1k
CDC OUTPUT CODE
FREQUENCY (Hz)
10k
100mV
200mV
30k
40k
100k
100k
50k
300mV
400mV
500mV
1M
60k
200mV
AD7143
300mV
100mV
50mV
25mV
10M
10M
70k