AD590JRZ-RL 데이터 시트보기 (PDF) - Analog Devices
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AD590JRZ-RL Datasheet PDF : 16 Pages
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AD590
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 24 shows a circuit that combines
the principle demonstrated in Figure 23 with an 8-channel
CMOS multiplexer. The resulting circuit can select 1 to 80
sensors over only 18 wires with a 7-bit binary word.
The inhibit input on the multiplexer turns all sensors off for
minimum dissipation while idling.
Figure 25 demonstrates a method of multiplexing the AD590 in
the 2-trim mode (see Figure 12 and Figure 13). Additional AD590s
and their associated resistors can be added to multiplex up to
eight channels of ±0.5°C absolute accuracy over the temperature
range of −55°C to +125°C. The high temperature restriction of
125°C is due to the output range of the op amps; output to 150°C
can be achieved by using a 20 V supply for the op amp.
10V
ROW
SELECT
16
3
14
2
4028
CMOS
BCD-TO-
DECIMAL
11 DECODER
12
13
10
8
0
1
2
+
+
+
+
+
+
AD590
+
– 02 +
– 01 +
– 00
– 12
– 11
– 10
– 22
– 21
– 20
10V
21 0
16
15 14 13
COLUMN
SELECT
INHIBIT
9
10
LOGIC
LEVEL
11 INTERFACE
6
78
BINARY TO 1-OF-8 DECODER
4051 CMOS ANALOG
MULTIPLEXER
10kΩ 10mV/°C
Figure 24. Matrix Multiplexer
+15V
35.7kΩ 2kΩ
AD581
35.7kΩ 2kΩ
VOUT
5kΩ 97.6kΩ
5kΩ 97.6kΩ
S1
S2
DECODER/
DRIVER
S8
+15V
–15V
AD7501
TTL/DTL TO CMOS
INTERFACE
V+
AD707A
10mV/°C
–15V
27kΩ
AD590L
AD590L
EN
BINARY
CHANNE L
SELECT
–5V TO –15V
Figure 25. 8-Channel Multiplexer
Rev. E | Page 12 of 16
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