ADT7490
TYPICAL PERFORMANCE CHARACTERISTICS (Cont’d)
3.0
2.5
2.0
1.5
1.0
0.5
0
? 0.5
? 1.0
? 1.5
? 40
? 20
0
25
40
60
70
85
100
125
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
DEV 17
DEV 18
DEV 19
DEV 20
DEV 21
DEV 22
DEV 23
DEV 24
DEV 25
DEV 26
DEV 27
DEV 28
DEV 29
DEV 30
DEV 31
DEV 32
MEAN
LOW SPEC
HIGH SPEC
3.0
2.5
2.0
1.5
1.0
0.5
0
? 0.5
? 1.0
? 1.5
? 2.0
? 40
? 20
0
25
40
60
70
85
100
125
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
DEV 17
DEV 18
DEV 19
DEV 20
DEV 21
DEV 22
DEV 23
DEV 24
DEV 25
DEV 26
DEV 27
DEV 28
DEV 29
DEV 30
DEV 31
DEV 32
MEAN
LOW SPEC
HIGH SPEC
TEMPERATURE ( ? C)
Figure 5. Local Temperature Sensor Error
TEMPERATURE ( ? C)
Figure 6. Remote 1 Temperature Sensor Error
3.0
2.5
2.0
1.5
1.0
0.5
0
? 0.5
? 1.0
? 1.5
? 2.0
? 40
? 20
0
25
40
60
70
85
100
125
DEV 1
DEV 2
DEV 3
DEV 4
DEV 5
DEV 6
DEV 7
DEV 8
DEV 9
DEV 10
DEV 11
DEV 12
DEV 13
DEV 14
DEV 15
DEV 16
DEV 17
DEV 18
DEV 19
DEV 20
DEV 21
DEV 22
DEV 23
DEV 24
DEV 25
DEV 26
DEV 27
DEV 28
DEV 29
DEV 30
DEV 31
DEV 32
MEAN
LOW SPEC
HIGH SPEC
140
120
100
80
60
40
20
0
0
EXTERNAL 2
LOCAL
10 20
EXTERNAL 1
30
40
50
60
TEMPERATURE ( ? C)
Figure 7. Remote 2 Temperature Sensor Error
TIME (s)
Figure 8. ADT7490 Response to Thermal Shock
8
6
4
2
0
? 2
? 4
? 6
DEV 1
DEV 3
DEV 2
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
? 0.5
100 mV
250 mV
? 8
0
200
400
600
800 1000 1200 1400 1600
? 1.0
0
100
200
300
400
500
600
SERIES RESISTANCE ( W )
Figure 9. Temperature Error vs. Series Resistance
POWER SUPPLY NOISE FREQUENCY (MHz)
Figure 10. Local Temperature Error vs. Power
Supply Noise Frequency
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