ADT7490
TYPICAL CHARACTERISTICS
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
0
100mV
250mV
100
200
300
400
500
600
POWER SUPPLY NOISE FREQUENCY (MHz)
20
15
10
5
0
–5
–10
0
100mV
60mV
40mV
100
200
300
400
500
600
COMMON−MODE NOISE FREQUENCY (MHz)
Figure 11. Remote Temperature Error vs. Power
Supply Noise Frequency
Figure 12. Temperature Error vs. Common−Mode
Noise Frequency
160
140
120
100
80
60
40
20
0
−20
0
60mV
100mV
40mV
100
200
300
400
500
600
DIFFERENTIAL MODE NOISE FREQUENCY (MHz)
Figure 13. Temperature Error vs. Differential Mode
Noise Frequency
5
0
DEV 3
–5
–10
DEV 2
–15
DEV 1
–20
–25
–30
–35
0 2 4 6 8 10 12 14 16 18 20 22
CAPACITANCE (nF)
Figure 14. Temperature Error vs. Capacitance
Between D+ and D−
1.5
DEV 2
1.0
DEV 1
0.5
DEV 3
0
–0.5
–1.0
–1.5
–2.0
3.0
3.1
3.2
3.3
3.4
3.5
3.6
VDD (V)
Figure 15. TACH Accuracy vs. Supply Voltage
8
6
DEV 3
4
2
DEV 2
0
DEV 1
–2
–4
–6
–8
–40 –20
0
20
40
60
80 100 120
TEMPERATURE (5C)
Figure 16. TACH Accuracy vs. Temperature
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