DDC232_17 Datasheet, PDF (6/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS
At T_A = +25°C, unless otherwise indicated.
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
NOISE vs C_SENSOR
Range 1
Range 2
Range 7
100 200 300 400 500 600 700 800 900 1000
C_SENSOR (pF)
Figure 1.
CSENSOR
(pF)
0
22
47
68
100
150
330
470
1000
Range 0
27
38
51
59
74
100
180
250
520
Table 1. NOISE vs C_SENSOR (ppm of FSR, rms)
Range 1
9.1
12
15
18
22
29
50
67
130
Range 2
6.3
7.9
9.8
11
13
16
27
36
57
NOISE (ppm of FSR, rms)
Range 3
Range 4
5.5
5.2
6.5
5.8
7.7
6.7
8.5
7.3
9.9
8.3
12
10
19
15
25
19
49
37
Range 5
5
5.5
6.1
6.6
7.4
8.7
13
16
30
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Range 6
4.9
5.3
5.8
6.1
6.8
7.8
11
14
26
Range 7
4.8
5.1
5.5
5.8
6.3
7.2
10
12
22
CSENSOR
(pF)
0
22
47
68
100
150
330
470
1000
Range 0
0.34
0.48
0.64
0.74
0.93
1.25
2.25
3.13
6.50
Range 1
0.46
0.60
0.75
0.90
1.10
1.45
2.50
3.35
6.50
Table 2. NOISE vs C_SENSOR (fC, rms)
Range 2
0.63
0.79
0.98
1.10
1.30
1.60
2.70
3.60
5.70
NOISE (fC, rms)
Range 3
Range 4
0.83
1.04
0.98
1.16
1.16
1.34
1.28
1.46
1.49
1.66
1.80
2.00
2.85
3.00
3.75
3.80
7.35
7.40
Range 5
1.25
1.38
1.53
1.65
1.85
2.18
3.25
4.00
7.50
Range 6
1.47
1.59
1.74
1.83
2.04
2.34
3.30
4.20
7.80
Range 7
1.68
1.79
1.93
2.03
2.21
2.52
3.50
4.20
7.70
CSENSOR
(pF)
0
22
47
68
100
150
330
470
1000
Range 0
2100
2960
3970
4600
5770
7800
14000
19500
40500
Table 3. NOISE vs C_SENSOR (electrons, rms)
Range 1
2840
3740
4680
5610
6860
9050
15600
20900
40500
Range 2
3930
4930
6110
6860
8110
9980
16800
22400
35500
NOISE (electrons, rms)
Range 3
Range 4
5140
6490
6080
7240
7200
8360
7950
9110
9260
10300
11200
12400
17700
18700
23400
23700
45800
46100
Range 5
7800
8580
9510
10200
11500
13500
20200
24900
46800
Range 6
9170
9920
10800
11400
12700
14600
20500
26200
48600
Range 7
10400
11100
12000
12600
13700
15700
21800
26200
48000
6
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