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ADM1024ARUZ Datasheet(PDF) 15 Page - ON Semiconductor

Part No. ADM1024ARUZ
Description  System Hardware Monitor with Remote Diode Thermal Sensing
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1024ARUZ Datasheet(HTML) 15 Page - ON Semiconductor

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ADM1024
http://onsemi.com
15
Analog Output
The ADM1024 has a single analog output from an
unsigned 8−bit DAC that produces 0 V to 2.5 V. The analog
output register defaults to FF during power−on reset, which
produces maximum fan speed. The analog output may be
amplified and buffered with external circuitry such as an op
amp and transistor to provide fan speed control.
Suitable fan drive circuits are given in Figure 19 to Figure 24.
When using any of these circuits, the following points should be
noted:
1. All of these circuits will provide an output range
from 0 V to almost 12 V, apart from Figure 25
which loses the base−emitter voltage drop of Q1
due to the emitter−follower configuration.
2. To amplify the 2.5 V range of the analog output up
to 12 V, the gain of these circuits needs to be
around 4.8.
3. Care must be taken when choosing the op amp to
ensure that its input common−mode range and
output voltage swing are suitable.
4. The op amp may be powered from the 12 V rail
alone or from 12 V. If it is powered from 12 V,
then the input common− mode range should
include ground to accommodate the minimum
output voltage of the DAC, and the output voltage
should swing below 0.6 V to ensure that the
transistor can be turned fully off.
5. If the op amp is powered from −12 V, precautions
such as a clamp diode to ground may be needed to
prevent the base−emitter junction of the output
transistor being reverse−biased in the unlikely
event that the output of the op amp should swing
negative for any reason.
Figure 19. Fan Drive Circuit with Op Amp and
Emitter−Follower
AOUT
12V
Q1
2N2219A
1/4
LM324
R1
10kΩ
R2
36kΩ
Figure 20. Fan Drive Circuit with Op Amp and PNP
Transistor
AOUT
12V
Q1
BD136
2SA968
1/4
LM324
R1
10kΩ
R3
1kΩ
R2
39kΩ
R4
1kΩ
Figure 21. Fan Driver Circuit with Op Amp and
P−Channel MOSFET
AOUT
12V
Q1
IRF9620
1/4
LM324
R1
10kΩ
R3
100kΩ
R2
39kΩ
Figure 22. Discrete Fan Drive Circuit with P−Channel
MOSFET, Single Supply
AOUT
12V
Q3
IRF9620
R2
100kΩ
R3
3.9kΩ
R4
1kΩ
R1
100kΩ
Q1/Q2
MBT3904
DUAL
Figure 23. Discrete Fan Drive Circuit with P−Channel
MOSFET, Dual Supply
AOUT
12V
Q3
IRF9620
R2
100kΩ
–12V
Q1/Q2
MTB3904
DUAL
R3
39kΩ
R4
10kΩ
R1
4.7kΩ
Figure 24. Discrete Fan Drive Circuit with Bipolar
Output, Dual Supply
AOUT
12V
R2
100kΩ
Q4
BD132
TIP32A
Q3
BC556
2N3906
Q1/Q2
MBT3904
DUAL
R1
100kΩ
R3
3.9kΩ
R4
1kΩ
R5
100kΩ


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