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AD592CN Datasheet(PDF) 8 Page - Analog Devices |
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AD592CN Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page AD592 REV. A –8– To minimize the number of MUXs required when a large num- ber of AD592s are being used, the circuit can be configured in a matrix. That is, a decoder can be used to switch the supply volt- age to a column of AD592s while a MUX is used to control which row of sensors are being measured. The maximum num- ber of AD592s which can be used is the product of the number of channels of the decoder and MUX. An example circuit controlling 80 AD592s is shown in Figure 16. A 7-bit digital word is all that is required to select one of the sensors. The enable input of the multiplexer turns all the sensors off for minimum dissipation while idling. +15V COLUMN SELECT 4028 BCD TO DECIMAL DECODER ROW SELECT EN +15V –15V 80 – AD592s 10k Ω VOUT Figure 16. Matrix Multiplexer To convert the AD592 output to °C or °F a single inexpensive reference and op amp can be used as shown in Figure 17. Al- though this circuit is similar to the two temperature trim circuit shown in Figure 6, two important differences exist. First, the gain resistor is fixed alleviating the need for an elevated tem- perature trim. Acceptable accuracy can be achieved by choosing an inexpensive resistor with the correct tolerance. Second, the AD592 calibration error can be trimmed out at a known conve- nient temperature (i.e., room temperature) with a single pot ad- justment. This step is independent of the gain selection. R ROFFSET/RGAIN AD741 VOUT = 100mV/( oC OR oF) +5V AD1403 V– oC oF ≈ 9.1kΩ ≈ 9.8kΩ 100k Ω 180k Ω RGAIN ROFFSET AD592 RCAL 2.5V RGAIN ROFFSET Figure 17. Celsius or Fahrenheit Thermometer OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 0.105 (2.66) 0.080 (2.42) 0.105 (2.66) 0.080 (2.42) 0.165 (4.19) 0.125 (3.94) SQUARE 0.019 (0.482) 0.016 (0.407) 0.105 (2.66) 0.095 (2.42) 0.055 (1.39) 0.045 (1.15) SEATING PLANE 0.500 (12.70) MIN 0.205 (5.20) 0.175 (4.96) 0.210 (5.33) 0.170 (4.32) 12 3 BOTTOM VIEW 0.135 (3.43) MIN 0.050 (1.27) MAX |
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