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參數(shù)資料
| 型號(hào)： | ADM1028ARQZ-REEL7 |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 379K |
| 代理商： | ADM1028ARQZ-REEL7 |
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REV. B
ADM1028
–9–
7. For really long distances (up to 100 feet) use shielded twisted-
pair such as Belden #8451 microphone cable. Connect the
twisted pair to D+ and D– and the shield to GND close to
the ADM1028. Leave the remote end of the shield uncon-
nected to avoid ground loops.
10MIL
GND
D+
D–
GND
Figure 4. Arrangement of Signal Tracks
Because the measurement technique uses switched current
sources, excessive cable and/or filter capacitance can affect the
measurement. When using long cables, the filter capacitor C1
may be reduced or removed. In any case, the total shunt capaci-
tance should not exceed 1000 pF.
Cable resistance can also introduce errors. 1
W series resistance
introduces about 0.5
∞C error.
ANALOG OUTPUT
The ADM1028 has a single analog output (FAN_SPD) from an
unsigned 8-bit DAC which produces 0 V–2.5 V. The analog
output register defaults to 00 during power-on reset, which pro-
duces minimum fan speed. The analog output may be amplified
and buffered with external circuitry such as an op amp and tran-
sistor to provide fan speed control.
Suitable fan drive circuits are given in Figures 5a to 5e. When
using any of these circuits, the following points should be noted:
1. All of these circuits will provide an output range from zero
to almost +VFAN.
2. To amplify the 2.5 V range of the analog output up to
+VFAN, the gain of these circuits needs to be set as shown.
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 +V rail alone. If it is
powered from +V then the input common-mode range
should include ground to accommodate the minimum out-
put 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. In all these circuits, the output transistor must have an ICMAX
greater than the maximum fan current, and be capable of
dissipating power due to the voltage dropped across it when
the fan is not operating at full-speed.
6. If the fan motor produces a large back e.m.f. when switched
off, it may be necessary to add clamp diodes to protect the
output transistors in the event that the output very quickly
goes from full-scale to zero.
Figure 5c shows how the
FAN_OFF signal may be used (with
any of the control circuits) to gate the fan on and off indepen-
dent of the value on the FAN_SPD/NTEST_IN pin.
FAN_SPD
5V
Q1
NDT452 P
5V
FAN
R1
10k
R2
15k
+
AD8541
Figure 5a. 5 V Fan Circuit with Op Amp
12V
Q1
BD136
2SA968
R1
10k
R2
39k
R3
1k
R4
1k
+
AD8519
FAN_SPD
Figure 5b. 12 V Fan Circuit with Op Amp and PNP
Transistor
12V
R1
10k
R2
39k
R3
100k
Q1
NDT452 P
R4
1k
3.3V
FAN_OFF
+
AD8519
FAN_SPD
Q2
MMFT305 5V
Figure 5c. 12 V Fan Circuit with Op Amp and
P-Channel MOSFET
12V
Q3
NDT452 P
R4
100k
R2
3.9k
R1
1k
R3
100k
FAN_SPD
R5
5k
Q1/Q2
MBT3904
DUAL
Figure 5d. Discrete 12 V Fan Drive Circuit with
P-Channel MOSFET, Single Supply
12V
Q4
BD132
TIP32A
R4
100k
R5
100k
FAN_SPD
R6
5k
Q1/Q2
MBT3904
DUAL
R2
3.9k
R1
1k
R3
100
Q3
BC556
2N3906
Figure 5e. Discrete 12 V Fan Drive Circuit with
Bipolar Output Single Supply
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| ADM1029ARQ-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADM1029ARQZ | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 +/- 1 C Digital Serial RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| ADM1029ARQZ-R7 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 +/- 1 C Digital Serial RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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