Datasheet

Data Sheet ADAS3022
Rev. B | Page 13 of 40
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
7FFC
7FFD
7FFE
7FFF
8000
8001 8002
8003 8004
8005 8006
8007
8008 8009
COUNT
CODE IN HEX
10516-120
GAIN = 6.4
300
200
21,700
82,000
157,300
151,900
75,100
18,400
2,400
100
Figure 12. Histogram of a DC Input at Code Center, PGIA Gain = 6.4
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3
0.4
0.5
0.6 0.7
0.8
0.9
1.0
COUNT
OFFSET DRIFT (ppm/°C)
EXTERNAL REFERENCE
GAIN = 0.16, 0.2, 0.4, 0.8, 1.6
f
S
= 1000kSPS
10516-155
Figure 13. Offset Drift, PGIA Gain = 0.16, 0.2, 0.4, 0.8, and 1.6
0
10
20
30
40
50
60
70
80
90
100
0 0.2 0.4 0.6 0.8
1.0
1.2 1.4
1.6
1.8
2.0
COUNT
OFFSET DRIFT (ppm/°C)
EXTERNAL REFERENCE
GAIN = 3.2
f
S
= 1000kSPS
10516-156
Figure 14. Offset Drift, PGIA Gain = 3.2
0
10
20
30
40
50
60
70
80
90
100
0 0.4 0.8 1.2 1.6
2.0
2.4 2.8
3.2
3.6
4.0
COUNT
OFFSET DRIFT (ppm/°C)
EXTERNA
L
RE
FE
R
EN
CE
GAIN = 6.4
f
S
= 1000
k
SPS
10516-157
Figure 15. Offset Drift, PGIA Gain = 6.4
112
72
23
2
0
20
40
60
80
100
120
0 1 2 3 4 5 6 7 8 9 10
COUNT
REFERENCE BUFFER DRIFT (ppm/°C)
f
S
= 1000kSPS
EXTERNAL 2.5V REFERENCE
INTERNAL BUFFER
10516-140
Figure 16. Reference Buffer Drift, External Reference
46
35
30
15 15
11
10
6
2
1
0
20
40
60
80
100
120
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
COUNT
REFERENCE BUFFER DRIFT (ppm/°C)
38
f
S
= 1000kSPS
INTERNAL 2.5V REFERENCE
INTERNAL BUFFER
10516-141
Figure 17. Reference Buffer Drift, Internal Reference