ADM1024ARUZ-REEL7 查看數據表（PDF） - Analog Devices
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ADM1024ARUZ-REEL7 Datasheet PDF : 32 Pages
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INPUT SAFETY
Scaling of the analog inputs is performed on chip, so external
attenuators are normally not required. However, since the power
supply voltages will appear directly at the pins, it is advisable
to add small external resistors in series with the supply traces
to the chip to prevent damaging the traces or power supplies
should an accidental short such as a probe connect two power
supplies together.
ADM1024
As the resistors will form part of the input attenuators, they will
affect the accuracy of the analog measurement if their value is
too high. The analog input channels are calibrated assuming an
external series resistor of 500 Ω, and the accuracy will remain
within specification for any value from 0 kΩ to 1 kΩ, so a stan-
dard 510 Ω resistor is suitable.
The worst such accident would be connecting –12 V to +12 V—
a total of 24 V difference. With the series resistors, this would
draw a maximum current of approximately 24 mA.
AOUT
+
1/4
LM324
R2
36k⍀
R1
10k⍀
12V
Q1
2N2219A
Figure 9a. Fan Drive Circuit with Op Amp and
Emitter-Follower
12V
AOUT
+
1/4
LM324
R4
1k⍀
R3
1k⍀
R1
10k⍀
R2
39k⍀
Q1
BD136
2SA968
Figure 9b. Fan Drive Circuit with Op Amp and
PNP Transistor
12V
AOUT
+
1/4
LM324
R3
100k⍀
Q1
IRF9620
R1
10k⍀
R2
39k⍀
Figure 9c. Fan Driver Circuit with Op Amp and
P-Channel MOSFET
R1
100k⍀
R2
100k⍀
12V
Q3
IRF9620
AOUT
Q1/Q2
MBT3904
DUAL
R3
3.9k⍀
R4
1k⍀
Figure 9d. Discrete Fan Drive Circuit with
P-Channel MOSFET, Single Supply
+12V
R2
100k⍀
Q3
IRF9620
AOUT
Q1/Q2
MBT3904
DUAL
R1
4.7k⍀
R3
39k⍀
R4
10k⍀
–12V
Figure 9e. Discrete Fan Drive Circuit with
P-Channel MOSFET, Dual Supply
12V
R1
100k⍀
R2
100k⍀
Q3
BC556
2N3906
AOUT
Q1/Q2
MBT3904
DUAL
R3
3.9k⍀
R5
100⍀
R4
1k⍀
Q4
BD132
TIP32A
Figure 9f. Discrete Fan Drive Circuit with Bipolar
Output Dual Supply
REV. B
–15–
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