AD7142 Analog Devices, AD7142 Datasheet - Page 5

• Manufacturer Part Number: AD7142
• Description: Programmable Controller for Capacitance Touch Sensors
• Manufacturer: Analog Devices

Specifications of AD7142

• Resolution (bits): 16bit
• # Chan: 14
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: ± 2 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

Table 2. Typical Average Current in Low Power Mode, AV
Low Power Mode
Delay
200 ms
400 ms
600 ms
800 ms
Table 3. Maximum Average Current in Low Power Mode, AV
Low Power Mode
Delay
200 ms
400 ms
600 ms
800 ms
Decimation
Rate
128
256
128
256
128
256
128
256
Decimation
Rate
128
256
128
256
128
256
128
256
Number of Conversion Stages (Current Values Expressed in μA)
1
45.4
56.2
39.5
45
37.5
41.2
36.5
39.3
Number of Conversion Stages (Current Values Expressed in μA)
1
26.4
35.6
21.3
26
19.6
22.7
18.7
21.1
PLASTIC OVERLAY
SENSOR BOARD
2
53.6
72
43.6
53.1
40.3
46.7
38.6
43.4
CAPACITIVE SENSOR
2
33.3
49.1
24.8
32.9
21.9
27.4
20.5
24.6
3
61.5
87.2
47.7
61.1
43
52.1
40.7
47.5
3
40.1
62.2
28.3
39.7
24.3
32
22.2
28.1
CC
, DV
Figure 2.
Rev. A | Page 5 of 72
4
69.4
102
51.8
68.9
45.8
57.4
42.7
51.5
CC
CC
4
46.9
74.9
31.7
46.5
26.6
36.6
24
31.5
, DV
= 3.6 V, T= 25°C, Load of 50 pF on SRC Pin, No Load on SRC
CC
5
77.1
116.3
55.8
76.7
48.5
62.7
44.8
55.6
= 3.6 V, Load of 50 pF on SRC Pin, No Load on SRC
5
53.5
87.3
35.2
53.1
28.9
41.1
25.7
35
C
C
BULK
IN
6
84.7
130.2
59.8
84.3
51.2
67.9
46.8
59.5
6
60
99.3
38.6
59.6
31.2
45.6
27.5
38.4
7
92.2
143.7
63.7
91.8
53.9
73.1
48.8
63.5
7
66.5
111
42
66.1
33.5
50
29.2
41.8
8
99.6
156.8
67.6
99.1
56.5
78.2
50.9
67.4
8
72.8
122.3
45.4
72.4
35.8
54.4
31
45.2
9
106.8
169.5
71.5
106.4
59.2
83.3
52.9
71.3
9
79.1
133.4
48.7
78.7
38.1
58.8
32.7
48.5
10
113.9
181.8
75.4
113.6
61.8
88.3
54.9
75.2
10
85.2
144.2
52
84.9
40.4
63.1
34.4
51.8
11
121
193.8
79.2
120.6
64.5
93.3
56.9
79
11
91.3
154.7
55.3
91
42.6
67.4
36.1
55.1
AD7142
12
127.9
205.5
83
127.5
67.1
98.2
58.9
82.8
12
97.3
164.9
58.6
97
44.8
71.6
37.8
58.4