AD645 Ver la hoja de datos (PDF) - Analog Devices
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AD645 Datasheet PDF : 8 Pages
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AD645–Typical Characteristics (@ +25؇C, ؎15 V unless otherwise noted)
100
1k
1000
10
100
100
1.0
10
10
RS = 10MΩ
RS = 1MΩ
RS = 100kΩ
RS = 100Ω
0.1
1
10
100
1k
10k 100k 1M
FREQUENCY – Hz
Figure 7. Current Noise Spectral
Density vs. Frequency
0
1
10
100
1k
10k
100k
FREQUENCY – Hz
Figure 8. Voltage Noise Spectral
Density vs. Frequency
1
0.1
1.0
10
100
1k
10k 100k
FREQUENCY – Hz
Figure 9. Voltage Noise Spectral
Density vs. Frequency for Various
Source Resistances
1k
100
NOISE BANDWIDTH: 0.1 to 10Hz
10
1.0
10 3
10 4
10 5
10 6
107
10 8
10 9
SOURCE RESISTANCE – Ω
Figure 10. Input Voltage Noise vs.
Source Resistance
25
100
fo = 1kHz
20
10
CURRENT NOISE
15
1
10
0.1
VOLTAGE NOISE
5
–60 –40 –20
0.01
0 20 40 60 80 100 120 140
TEMPERATURE – C
Figure 11. Voltage and Current
Noise Spectral Density vs.
Temperature
1k
100
NOISE OF AD645
AND RESISTOR
10
SOURCE
RESISTANCE
RESISTOR NOISE
ONLY
1.0
100
1k
10k 100k 1M
10M
SOURCE RESISTANCE – Ω
100M
Figure 12. Voltage Noise Spectral
Density @ 1 kHz vs. Source
Resistance
50
TA = +25 C
VS = ±15V
25
0
– 25
– 50
0
1
2
3
4
5
WARM-UP TIME – Minutes
Figure 13. Change in Input Offset
Voltage vs. Warmup Time
150
75
TA = 25°C TO TA = 85°C
0
–75
–150
0
1
2
3
4
5
TIME FROM THERMAL SHOCK – Minutes
Figure 14. Change in Input Offset
Voltage vs. Time from Thermal
Shock
10 – 9
10 – 9
10 –10
10 –11
INPUT
BIAS
CURRENT
10 –10
10 –11
10 –12
10 –13
INPUT
OFFSET
CURRENT
10 –12
10 –13
10 – 14
– 60 – 40 –20
10 – 14
0 20 40 60 80 100 120 140
TEMPERATURE – C
Figure 15. Input Bias and Offset
Currents vs. Temperature
–4–
REV. B
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