ISL26132_14 Datasheet, PDF (9/23 Pages) Intersil Corporation – Low-Noise 24-bit Delta Sigma ADC

ISL26132, ISL26134
Typical Characteristics (Continued)
50
GAIN = 128
RATE = 10Sps
30
10
-10
-30
60
GAIN = 128, N = 1024
RATE = 10Sps
50 _{STD DEV = 8.757 LSB}
VREF = 2.5V
40
30
20
10
-50
0
200
400
600
800
TIME (SAMPLES)
FIGURE 8. NOISE AT GAIN = 128, 10Sps
1000
0
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30
OUTPUT CODE (LSB)
FIGURE 9. NOISE HISTOGRAM AT GAIN = 128, 10Sps
25
GAIN = 1
20 _{RATE = 80Sps}
15
10
5
0
-5
-10
-15
-20
-25
0
200
400
600
800
TIME (SAMPLES)
FIGURE 10. NOISE AT GAIN = 1, 80Sps
1000
120
GAIN = 1, N = 1024
RATE = 80Sps
100 _{STD DEV = 3.791 LSB}
VREF = 2.5V
80
60
40
20
0
-15
-10
-5
0
5
OUTPUT CODE (LSB)
10
15
FIGURE 11. NOISE HISTOGRAM AT GAIN = 1, 80Sps
25
GAIN = 2
RATE = 80Sps
15
5
-5
-15
120
GAIN = 2, N = 1024
RATE = 80Sps
100 _{STD DEV = 3.831 LSB}
VREF = 2.5V
80
60
40
20
-25 ₀
200
400
600
800
TIME (SAMPLES)
FIGURE 12. NOISE AT GAIN = 2, 80Sps
1000
0
-15
-10
-5
0
5
OUTPUT CODE (LSB)
10
15
FIGURE 13. NOISE HISTOGRAM AT GAIN = 2, 80Sps
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9
FN6954.3
November 20, 2014