AD590 感 江 1 CMOS ANALOG ACE INHIB H BINARY TO O S DEcoCt lCks 10mv/ Figure 18. Matrix Multiplexer CMOS Analog Multiplexers can also be used to switch AD590 current. Due to the ad590's current mode, the resistance of the transducer. Figure 18 shows a circuit which combines the p such switches is unimportant as long as 4 V is maintained acro: principal demonstrated in Figure 17 with an 8-channel CMOS Multiplexer. The resulting circuit can select one of eighty sensors over only 18 wires with a 7-bit binary word. The inhibit put on the multiplexer turns all sensors off for minimum dissipation while idling AD581 AD600 Figure 19. 8-Channel Multiplexer Figure 19 demonstrates a method of multiplexing the AD590 in the two-trim mode(Figure 7). Additional AD590s and their associated resistors can be added to multiplex up to 8 channels of +0.5'C absolute accuracy over the temperature range of 55C to +125C. The high temperature restriction of +125C is due to the output range of the op amps; output to +150C can be achieved by using a +20 V supply for the op ampAD590 REV. B –9– Figure 18. Matrix Multiplexer Figure 19. 8-Channel Multiplexer 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 18 shows a circuit which combines the principal demonstrated in Figure 17 with an 8-channel CMOS Multiplexer. The resulting circuit can select one of eighty 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 19 demonstrates a method of multiplexing the AD590 in the two-trim mode (Figure 7). Additional AD590s and their associated resistors can be added to multiplex up to 8 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