AD538 Analog Devices, AD538 Datasheet
AD538
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AD538 Summary of contents
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... Finally, a wide power supply range of 4 allows operation from standard and 15 V supplies. The AD538 is available in two accuracy grades (A and B) over the industrial (– +85 C) temperature range and one grade (S) over the military (– +125 C) temperature range ...
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... X 3 When using supplies below 13 V, the 10 V reference pin must be connected to the 2 V pin in order for the AD538 to operate correctly. Specifications subject to change without notice. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units ...
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... Rather than as a percent of full scale, the AD538’s error as a multiplier or divider for a 100:1 (100 input range is specified as the sum of two error components: a percent of reading (ideal output) term plus a fixed output offset ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD538 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... Figure 5. Multiplier Error vs. Temperature (10 mV < 100 mV 5.0 4.0 3.0 2 READING 1.0 OFFSET 0 –55 –40 – 100 TEMPERATURE – C Figure 6. Divider Error vs. Temperature (10 mV < 100 mV AD538 10 1200 1000 800 600 400 200 0 125 1000 800 600 400 200 0 125 ...
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... Thus the overall AD538 transfer function equals where 0.2 < m < When the AD538 is used as an analog divider, the V be used to multiply the ratio V The actual multiplication by the V by adding the log of the V is already in the log domain. –6– 100 ...
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... If both references are required simultaneously, the +10 V output should be used directly and the +2 V output should be externally buffered. REV. C ONE-QUADRANT MULTIPLICATION/DIVISION Figure 12 shows how the AD538 may be easily configured as a precision one-quadrant multiplier/divider. The transfer function OUT a calculation not available with a conventional multiplier. In addition, the 1000:1 (i ...
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... ADJUST Figure 13. Two-Quadrant Division with 10 V Scaling LOG RATIO OPERATION Figure 14 shows the AD538 configured for computing the log of the ratio of two input voltages (or currents). The output signal from B is connected to the summing junction of the output ampli- fier via two series resistors. The 90.9 tively degrades the temperature coefficient of the 3500 ppm/ C resistor to produce a 1 ...
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... –1 the AD538 functions as a summing junction necessary preserve the sign of the input voltage, the polarity of the op amp output may be sensed and used after the computation to switch the sign bit of a D.V.M. chip. ...
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... ARC-TANGENT APPROXIMATION The circuit of Figure 17 is typical of those AD538 applications where the quantity raised to powers greater than one. Z ...
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... REV. C OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Side-Brazed Ceramic DIP (D-18 0.30 (7.62) 0.28 (7.12 PIN 1 0.306 (7.78) 0.91 (23.12) 0.294 (7.47) 0.89 (22.61) 0.175 (4.45) MAX 0.125 (3.18) 0.02 (0.508) 0.105 (2.67) 0.06 (1.53) SEATING PLANE 0.015 (0.381) 0.095 (2.42) 0.04 (1.02) –11– AD538 0.12 (3.05) 0.06 (1.53) 0.012 (0.305) 0.008 (0.203) ...