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AD7142 Datasheet(PDF) 4 Page - Analog Devices

Part # AD7142
Description  Programmable Capacitance-to-Digital Converter with Environmental Compensation
PDF  68 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7142 Datasheet(HTML) 4 Page - Analog Devices

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AD7142
Rev. 0 | Page 4 of 68
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
POWER
AVCC, DVCC
2.6
3.3
3.6
V
VDRIVE
1.65
3.6
V
Serial interface operating voltage
ICC
0.9
1
mA
In full power mode
20
μA
Low power mode, converter idle, TA = 25°C
16
33
μA
Low power mode, converter idle
4.5
μA
Full shutdown, TA = 25°C
2.25
18
μA
Full shutdown
PLASTIC OVERLAY
1 CIN and CBULK are defined as follows:
SENSOR BOARD
CBULK
CIN
CAPACITIVE SENSOR
Table 2. Typical Average Current in Low Power Mode, AVCC, DVCC = 3.6 V, T= 25°C, Load of 50 pF on SRC Pin, No Load on SRC
Number of Conversion Stages, Current Values Expressed in μA
Low Power
Mode Delay
Decimation
Rate =
1
2
3
4
5
6
7
8
9
10
11
12
200 ms
128
26.4
33.3
40.1
46.9
53.5
60
66.5
72.8
79.1
85.2
91.3
97.3
256
35.6
49.1
62.2
74.9
87.3
99.3
111
122.3
133.4
144.2
154.7
164.9
400 ms
128
21.3
24.8
28.3
31.7
35.2
38.6
42
45.4
48.7
52
55.3
58.6
256
26
32.9
39.7
46.5
53.1
59.6
66.1
72.4
78.7
84.9
91
97
600 ms
128
19.6
21.9
24.3
26.6
28.9
31.2
33.5
35.8
38.1
40.4
42.6
44.8
256
22.7
27.4
32
36.6
41.1
45.6
50
54.4
58.8
63.1
67.4
71.6
800 ms
128
18.7
20.5
22.2
24
25.7
27.5
29.2
31
32.7
34.4
36.1
37.8
256
21.1
24.6
28.1
31.5
35
38.4
41.8
45.2
48.5
51.8
55.1
58.4
Table 3. Maximum Average Current in Low Power Mode, AVCC, DVCC = 3.6 V, Load of 50 pF on SRC Pin, No Load on SRC
Number of Conversion Stages, Current Values Expressed in μA
Low Power
Mode Delay
Decimation
Rate =
1
2
3
4
5
6
7
8
9
10
11
12
200 ms
128
45.4
53.6
61.5
69.4
77.1
84.7
92.2
99.6
106.8
113.9
121
127.9
256
56.2
72
87.2
102
116.3
130.2
143.7
156.8
169.5
181.8
193.8
205.5
400 ms
128
39.5
43.6
47.7
51.8
55.8
59.8
63.7
67.6
71.5
75.4
79.2
83
256
45
53.1
61.1
68.9
76.7
84.3
91.8
99.1
106.4
113.6
120.6
127.5
600 ms
128
37.5
40.3
43
45.8
48.5
51.2
53.9
56.5
59.2
61.8
64.5
67.1
256
41.2
46.7
52.1
57.4
62.7
67.9
73.1
78.2
83.3
88.3
93.3
98.2
800 ms
128
36.5
38.6
40.7
42.7
44.8
46.8
48.8
50.9
52.9
54.9
56.9
58.9
256
39.3
43.4
47.5
51.5
55.6
59.5
63.5
67.4
71.3
75.2
79
82.8



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