(@ +608C and VS = 10 V, Type J (AD596), Type K (AD597) Thermocouple, AD596/AD597–SPECIFICATIONS unless otherwise noted) Model AD596AH Typ Max Min ABSOLUTE MAXIMUM RATINGS +VS to –VS Common-Mode Input Voltage Differential Input Voltage Alarm Voltages +ALM –ALM Operating Temperature Range Output Short Circuit to Common TEMPERATURE MEASUREMENT (Specified Temperature Range +25°C to +100°C) Calibration Error1 Stability vs.
AD596/AD597 Table I. Output Voltage vs. Thermocouple Temperature (Ambient +608C, VS = –5 V, +15 V) Thermocouple Temperature 8C Type J Voltage mV AD596 Output mV Type K Voltage mV Type J Voltage mV AD596 Output mV Type K Voltage mV AD597 Output mV –200 –180 –160 –140 –120 –7.890 –7.402 –6.821 –6.159 –5.426 –1370 –1282 –1177 –1058 –925 –5.891 –5.550 –5.141 –4.669 –4.138 –1446 –1362 –1262 –1146 –1016 500 520 540 560 580 27.388 28.511 29.642 30.782 31.933 5000 5203 5407 5613 5821 20.640 21.
AD596/AD597 Excluding calibration errors, the above transfer function is accurate to within 1°C from +80°C to +550°C for the AD596 and –20°C to +350°C for the AD597. The different temperature ranges are due to the differences in J and K type thermocouple curves. TEMPERATURE PROPORTIONAL OUTPUT MODE The AD596/AD597 can be used to generate a temperature proportional output of 10 mV/°C when operated with J and K type thermocouples as shown in Figure 1.
AD596/AD597 SETPOINT CONTROL MODE The AD596/AD597 can be connected as a setpoint controller as shown in Figure 2. The thermocouple voltage is cold junction compensated, amplified, and compared to an external setpoint voltage. The relationship between setpoint voltage and temperature is given in Table I. If the temperature to be controlled is within the operating range (–55°C to +125°C) of the device, it can monitor its own temperature by shorting the inputs to ground.
AD596/AD597 temperature differences will result in a direct error at the output. In the temperature proportional mode, the alarm feature will only activate in the event of an open thermocouple or system transient which causes the device output to saturate. Self-Heating errors will not effect the operation of the alarm but two cases do need to be considered. First, after a fault is corrected and the alarm is reset, the AD596/AD597 must be allowed to cool before readings can again be accurate.
AD596/AD597 +V TEMPERATURE CONSTANTAN (ALUMEL) IRON (CHROMEL) READOUT 8F 470V – LCD DISPLAY + +V AD596/ AD597* HEATER ICL7136 45.2kV IN HI 10kV IN LO 1.27MV +V *H PACKAGE PINOUT SHOWN 5V 40.2kV REF HI AD584 10kV REF LO SET-POINT ADJUST 5kV – 10kV 1kV OP07 + 10MV Figure 6. Temperature Measurement and Control REV.
AD596/AD597 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 10-Pin Metal Can (TO-100) 0.185 (4.70) 0.165 (4.19) 0.160 (4.06) 0.110 (2.79) 0.250 (6.35) MIN 0.050 (1.27) MAX 6 7 0.370 (9.40) 0.335 (8.51) 0.335 (8.51) 0.305 (7.75) 5 0.115 (2.92) BSC C831b–5–2/98 REFERENCE PLANE 0.750 (19.05) 0.500 (12.70) 8 4 0.045 (1.14) 0.027 (0.69) 9 3 2 0.019 (0.48) 0.016 (0.41) 10 1 0.230 (5.84) BSC 0.021 (0.53) 0.016 (0.41) 0.040 (1.02) MAX 0.045 (1.14) 0.010 (0.25) 0.034 (0.86) 0.027 (0.
