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Max Cal Max Error Max Nonlinearity Package Model Error @ +25 8C –25 8C to +1058C –25 8C to +1058C Option AD592CN 0.5 °C 1.0 °C 0.35 °C TO-92 AD592BN 1.0 °C 2.0 °C 0.4 °C TO-92 AD592AN 2.5 °C 3.5 °C 0.5 °C TO-92 AD592–SPECIFICATIONS AD592AN AD592BN AD592CN Model Min Typ Max Min Typ Max Min Typ Max Units ACCURACY TA = 0°C to +70°C TA = –25°C to +105°C OUTPUT CHARACTERISTICS Nominal Current Output @ +25°C (298.2K) 298.2 298.2 298.2 µA Temperature Coefficient 1 1 1 µA/°C Repeatability4 0.1 0.1 0.1 °C Long Term Stability5 0.1 0.1 0.1 °C/month ABSOLUTE MAXIMUM RATINGS Operating Temperature –25 +105 –25 +105 –25 +105 °C Package Temperature6 –45 +125 –45 +125 –45 +125 °C Forward Voltage (+ to –) 44 44 44 V Reverse Voltage (– to +) 20 20 20 V Lead Temperature (Soldering 10 sec) 300 300 300 °C POWER SUPPLY Operating Voltage Range 4 30 4 30 4 30 V Power Supply Rejection NOTES 1An external calibration trim can be used to zero the error @ +25 °C. 2Defined as the maximum deviation from a mathematically best fit line. 3Parameter tested on all production units at +105 °C only. C grade at –25 °C also. 4Maximum deviation between +25 °C readings after a temperature cycle between –45 °C and +125 °C. Errors of this type are noncumulative. 5Operation @ +125 °C, error over time is noncumulative. 6Although performance is not specified beyond the operating temperature range, temperature excursions within the package temperature range will not damage the device. 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. (typical @ TA = +258C, VS = +5 V, unless otherwise noted) TEMPERATURE SCALE CONVERSION EQUATIONS METALIZATION DIAGRAM 66MILS 42MILS REV. A–2– °R = °F +459.7 K = °C +273.158C = 9 (8F –32) 8F = 8C +32
Typical Performance Curves–AD592 Typical @ VS = +5 V TOTAL ERROR – oC TEMPERATURE – oC –25 0 +25 +70 +105 +2.0 +1.5 +1.0 +0.5 –0.5 –1.0 –1.5 –2.0 AD592CN Accuracy Over Temperature +2.0 +1.5 +1.0 +0.5 –0.5 –1.0 –1.5 TEMPERATURE – oC TOTAL ERROR – oC AD592AN Accuracy Over Temperature TOTAL ERROR – oC TEMPERATURE – oC –25 0 +25 +70 +105 +2.0 +1.5 +1.0 +0.5 –0.5 –1.0 –1.5 –2.0 AD592BN Accuracy Over Temperature 0.75 0.50 0.25 –0.25 –0.50 –0.75 0 500 1000 1500 2000 TIME – Hours TOTAL ERROR – oC Long-Term Stability @ +85 °C and 85% Relative Humidity REV. A –3– 0.75 0.50 0.25 –0.25 –0.50 –0.75 0 500 1000 1500 2000 TIME – Hours TOTAL ERROR – oC Long-Term Stability @ +125 °C
to 1 can be easily achieved using the above technique. 4–20 mA transmitter for use with 40 V, 1 k Ω systems. Figure 12. Temperature to 4–20 mA Current Transmitter system can be implemented with the circuit shown in Figure 13.
8 BITS
Figure 13. Temperature to Digital Output using the AD592 in the circuit of Figure 14. Figure 14. Variable Temperature Thermostat Figure 15. Remote Temperature Multiplexing
of channels of the decoder and MUX.
- A 7-bit digital word is all that is required to select one of
sensors off for minimum dissipation while idling.
4028 BCD TO DECIMAL DECODER
Figure 16. Matrix Multiplexer justment. This step is independent of the gain selection. Figure 17. Celsius or Fahrenheit Thermometer Dimensions shown in inches and (mm).