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參數資料
| 型號： | AD590 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Two-Terminal IC Temperature Transducer(兩端口溫度傳感器) |
| 中文描述： | 雙終端集成電路溫度傳感器（兩端口溫度傳感器） |
| 文件頁數： | 8/12頁 |
| 文件大?。?/td> | 157K |
| 代理商： | AD590 |
AD590
–8–
REV. B
Figure 14. 4 mA-to-20 mA Current Transmitter
Figure 14 is an example of a current transmitter designed to be
used with 40 V, 1 k
systems; it uses its full current range of
4 mA-to-20 mA for a narrow span of measured temperatures. In
this example the 1
μ
A/K output of the AD590 is amplified to
1 mA/
°
C and offset so that 4 mA is equivalent to 17
°
C and
20 mA is equivalent to 33
°
C. R
T
is trimmed for proper reading
at an intermediate reference temperature. With a suitable choice
of resistors, any temperature range within the operating limits of
the AD590 may be chosen.
Figure 15. Simple Temperature Control Circuit
Figure 15 is an example of a variable temperature control circuit
(thermostat) using the AD590. R
H
and R
L
are selected to set the
high and low limits for R
SET
. R
SET
could be a simple pot, a
calibrated multiturn pot or a switched resistive divider. Power-
ing the AD590 from the 10 V reference isolates the AD590 from
supply variations while maintaining a reasonable voltage (~7 V)
across it. Capacitor C
1
is often needed to filter extraneous noise
from remote sensors. R
B
is determined by the
β
of the power
transistor and the current requirements of the load.
Figure 16 shows the AD590 can be configured with an 8-bit
DAC to produce a digitally controlled set point. T his particular
circuit operates from 0
°
C (all inputs high) to +51
°
C (all inputs
Figure 16. DAC Set Point
low) in 0.2
°
C steps. T he comparator is shown with 1
°
C
hysteresis which is usually necessary to guard-band for extrane-
ous noise; omitting the 5.1 M
resistor results in no hysteresis.
Figure 17. AD590 Driven from CMOS Logic
T he voltage compliance and the reverse blocking characteristic
of the AD590 allows it to be powered directly from +5 V
CMOS logic. T his permits easy multiplexing, switching or
pulsing for minimum internal heat dissipation. In Figure 17 any
AD590 connected to a logic high will pass a signal current
through the current measuring circuitry while those connected
to a logic zero will pass insignificant current. T he outputs used
to drive the AD590s may be employed for other purposes, but
the additional capacitance due to the AD590 should be taken
into account.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD590_02 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:2-Wire, Current Output Temperature Transducer |
| AD590H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| AD590IF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Temperature Transducer/Sensor |
| AD590IF/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Temperature Transducer/Sensor |
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