DDC118 Datasheet, PDF (6/30 Pages) Burr-Brown (TI) – Octal Current Input 20-Bit Analog-To-Digital Converter

DDC118
SBAS325A − JUNE 2004 − REVISED JUNE 2005
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, characterization done with Range 5 (250pC), AVDD = +5V, DVDD = 3V, VREF = +4.096V, and Low-Power Mode: TINT = 400µs and CLK = 4MHz,
unless otherwise noted.
45
40
35
30
25
20
15
10
5
0
0
NOISE vs C_SENSOR
Range 1
Range 2
Range 7
100
200
300
400
500
C_SENSOR (pF)
NOISE vs T_INT
6
C_SENSOR = 50pF
5
4
C_SENSOR = 0pF
3
2
1
Range 5
0
0.1
1
10
100
T_INT (ms)
1000
NOISE vs TEMPERATURE
14
C_SENSOR = 50pF
12
Range 1
10
Range 2
Range 3
8
6
4
Range 7
2
0
−40
−15
10
35
60
85
Temperature (_C)
NOISE vs C_SENSOR
Noise (ppm of FSR, rms)
C_{SENSOR Range Range Range Range Range Range Range Range}
(pF) 0
1
2
3
4
5
6
7
0 23.6 7.3 5.2 4.4 4.2 4.0 3.8 3.7
24 30.8 10.4 6.7 5.5 4.9 4.5 4.3 4.1
50 36.3 12.3 8.2 6.5 5.6 5.1 4.8 4.4
75 41.3 14.4 8.9 7.2 6.0 5.4 5.1 4.7
100 46.1 16.0 10.0 8.0 6.7 5.9 5.4 5.0
150 57.0 18.8 11.9 9.2 7.8 6.8 6.1 5.7
200 68.1 21.7 13.5 10.2 8.6 7.6 6.8 6.4
300 89.3 27.7 16.3 12.5 10.6 9.0 8.1 7.4
500 134.0 38.9 22.4 16.6 13.5 11.7 10.4 9.5
NOISE vs INPUT LEVEL
8
7
6
C_SENSOR = 50pF
5
C_SENSOR = 0pF
4
3
2
1
Range 5
0
0 10 20 30 40 50 60 70 80
Input Level (% of Full−Scale)
90 100
2000
1500
RANGE DRIFT vs TEMPERATURE
All Ranges
1000
500
0
−500
−1000
−1500
−2000
−40
−15
10
35
60
85
Temperature (_ C)
6