Datasheet

AD590 Data Sheet
Rev. G | Page 12 of 16
Figure 24 demonstrates a method of multiplexing the AD590 in
the 2-trim mode (see Figure 13 and Figure 14). 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.
Figure 24. 8-Channel Multiplexer
00533-023
–
+
AD590L
–
+
AD590L
DECODER/
DRIVER
S1
S2
S8
AD7501
–15V
2kΩ
35.7kΩ
5kΩ
97.6kΩ
2kΩ
35.7kΩ
5kΩ
97.6kΩ
+15V
TTL/DTL TO CMOS
INTERFACE
BINARY
CHANNEL
SELECT
EN
–15V
27kΩ
10mV/°C
V+
OP177
+15V
AD581
V
OUT
–
+
–5V TO –15V