AD524J type thermocouple cold junction temperature compensation circuit shown in Figure 1-20. The circuit is detected by a J-type thermocouples, the base reference voltage sour
ce AD580, AD590 integrated temperature sensor and precision instrumentation amplifier AD524 constitution, AD590 compensate for the cold junction, when the cold junction temperature changes, AD590 to lVA/K output current, the current in AD524 foot forming a voltage amplifier and the output is changed vI stack. AD580 provides 2.SV reference voltage. AD524 low-drift (drift voltage 0.5mV, maximum drift 25 mV/oC), good linearity (a gain of l, linearity 0,003%) of high-speed (output slew rate of 5V/ms) operational amplifier.