Datasheet

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SBAS255C − JUNE 2004 − REVISED APRIL 2009
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6
TYPICAL CHARACTERISTICS
At T
A
= +25°C, characterization done with Range 5 (250pC), AVDD = +5V, DVDD = 3V, V
REF
= +4.096V, Low Power Mode: T
INT
= 400µs and CLK = 4MHz, unless
otherwise noted.
NOISE vs C
SENSOR
100 4000500300200
C
SENSOR
(pF)
Noise(ppmofFSR,rms)
45
40
35
30
25
20
15
10
5
0
Range 1
Range 2
Range 7
NOISE vs T
INT
1 10000.1 10010
T
INT
(
µ
s)
Noise (ppm of FSR, rms)
0
1
2
3
4
5
6
C
SENSOR
= 50pF
C
SENSOR
=0pF
Range 5
NOISE vs TEMPERATURE
14
12
10
8
6
4
2
0
−
40
−
15 10 35 60 85
Temperature (
_
C)
Noise (ppm of FSR, rms)
C
SENSOR
=50pF
Range 1
Range 3
Range 2
Range 7
NOISE vs C
SENSOR
Noise (ppm of FSR, rms)
C
SENSOR
(pF)
0
24
50
75
100
150
200
300
500
Range
0
23.6
30.8
36.3
41.3
46.1
57.0
68.1
89.3
134.0
Range
1
7.3
10.4
12.3
14.4
16.0
18.8
21.7
27.7
38.9
Range
2
5.2
6.7
8.2
8.9
10.0
11.9
13.5
16.3
22.4
Range
3
4.4
5.5
6.5
7.2
8.0
9.2
10.2
12.5
16.6
Range
4
4.2
4.9
5.6
6.0
6.7
7.8
8.6
10.6
13.5
Range
5
4.0
4.5
5.1
5.4
5.9
6.8
7.6
9.0
11.7
Range
6
3.8
4.3
4.8
5.1
5.4
6.1
6.8
8.1
10.4
Range
7
3.7
4.1
4.4
4.7
5.0
5.7
6.4
7.4
9.5
NOISE vs INPUT LEVEL
20 3010 800 10060 70 9040 50
Input Level (% of Full−Scale)
Noise (ppm of FSR, rms)
8
7
6
5
4
3
2
1
0
C
SENSOR
= 50pF
C
SENSOR
= 0pF
Range 5
RANGE DRIFT vs TEMPERATURE
−
40
−
15 10 35 60 85
Temperature (
_
C)
Range Drift (ppm)
2000
1500
1000
500
0
−
500
−
1000
−
1500
−
2000
All Ranges