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AD590LH 데이터시트(PDF) 11 Page - Analog Devices

부품명 AD590LH
상세설명  Two-Terminal IC Temperature Transducer
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AD590LH 데이터시트(HTML) 11 Page - Analog Devices

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AD590
Rev. C | Page 11 of 16
30pF
V+
4mA = 17°C
12mA = 25°C
20mA = 33°C
+
+
AD581
VOUT
RT
5k
10
10k
12.7k
35.7k
5k
500
AD590
AD707A
+
0.01
µF
V–
Figure 18. 4 mA to 20 mA Current Transmitter
Figure 19 is an example of a variable temperature control circuit
(thermostat) using the AD590. RH and RL are selected to set the
high and low limits for RSET. RSET could be a simple pot, a
calibrated multiturn pot, or a switched resistive divider.
Powering the AD590 from the 10 V reference isolates the
AD590 from supply variations while maintaining a reasonable
voltage (~7 V) across it. Capacitor C1 is often needed to filter
extraneous noise from remote sensors. RB is determined by the
β of the power transistor and the current requirements of the
load.
LM311
+
C1
2
3
4
1
7
10k
RSET
RL
RB
RH
V–
V+
V+
AD590
+
AD581
OUT
HEATING
ELEMENTS
GND
10V
Figure 19. Simple Temperature Control Circuit
Figure 20 shows that the AD590 can be configured with an 8-bit
DAC to produce a digitally controlled set point. This particular
circuit operates from 0°C (all inputs high) to 51.0°C (all inputs
low) in 0.2°C steps. The comparator is shown with 1.0°C
hysteresis, which is usually necessary to guard-band for
extraneous noise. Omitting the 5.1 MΩ resistor results in no
hysteresis.
MC
1408/1508
DAC OUT
–15V
+5V
REF
OUTPUT HIGH-
TEMPERATURE ABOVE SET POINT
OUTPUT LOW-
TEMPERATURE BELOW SET POINT
1.25k
+5V
+2.5V
AD580
20pF
BIT 1
BIT 8
BIT 2
BIT 7
BIT 3
BIT 6
BIT 4
BIT 5
1.15k
200
200
Ω, 15T
6.98k
1k
Ω, 15T
–15V
AD590
+
–15V
+5V
+5V
1
4
2
3
8
7
LM311
1k
5.1M
6.8k
Figure 20. DAC Set Point
The voltage compliance and the reverse blocking characteristic
of the AD590 allows it to be powered directly from 5 V CMOS
logic. This permits easy multiplexing, switching, or pulsing for
minimum internal heat dissipation. In Figure 21, any AD590
connected to a logic high passes a signal current through the
current measuring circuitry, while those connected to a logic
zero pass insignificant current. The 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.
5V
CMOS
GATES
AD590
1k
Ω (0.1%)
+
+
+
+
Figure 21. AD590 Driven from CMOS Logic
CMOS analog multiplexers can also be used to switch AD590
current. Due to the AD590’s current mode, the resistance of
such switches is unimportant as long as 4 V is maintained
across the transducer. Figure 22 shows a circuit that combines
the principle demonstrated in Figure 21 with an 8-channel
CMOS multiplexer. The resulting circuit can select 1–80 sensors
over only 18 wires with a 7-bit binary word.


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