AD7143 Analog Devices, AD7143 Datasheet - Page 8

• 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

AD7143
TYPICAL PERFORMANCE CHARACTERISTICS
1000
120
100
980
960
940
920
900
880
860
840
820
80
60
40
20
180
160
140
120
100
Figure 5. Low Power Supply Current vs. Supply Voltage,
80
60
40
2.7
Figure 6. Low Power Supply Current vs. Supply Voltage
2.7
2.7
LP_CONV_DELAY = 600ms
DEVICE 2
Figure 4. Supply Current vs. Supply Voltage
2.8
2.8
2.8
LP_CONV_DELAY = 200ms
LP_CONV_DELAY = 400ms
LP_CONV_DELAY = 600ms
LP_CONV_DELAY = 800ms
2.9
2.9
2.9
Decimation Rate = 256
Decimation Rate = 128
DEVICE 3
3.0
3.0
3.0
LP_CONV_DELAY = 200ms
LP_CONV_DELAY = 800ms
3.1
3.1
V
V
3.1
CC
CC
V
LP_CONV_DELAY = 400ms
CC
3.2
(V)
(V)
3.2
DEVICE 1
(V)
3.2
3.3
3.3
3.3
3.4
3.4
3.4
3.5
3.5
3.5
3.6
3.6
3.6
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16015
16010
16005
16000
15995
15990
15985
15980
2.45
2.30
2.15
2.00
1.85
1.70
1.55
1.40
1.10
1.05
1.00
0.95
0.90
0.85
0.80
2.7
Figure 7. Shutdown Supply Current vs. Supply Voltage
Figure 8. Supply Current vs. Capacitive Load on SRC
0
0
Figure 9. Output Code vs. Capacitive Load on SRC
DEVICE 3
2.8
50
50
DEVICE 1
DEVICE 1
100
100
2.9
CAPACITANCE LOAD ON SOURCE (pF)
CAPACITANCE LOAD ON SOURCE (pF)
DEVICE 3
150
150
3.0
200
200
3.1
V
CC
DEVICE 2
250
250
3.2
(V)
300
300
DEVICE 2
3.3
DEVICE 2
DEVICE 3
350
350
3.4
400
400
DEVICE 1
3.5
450
450
3.6
500
500