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The AD596/AD597 is a monolithic temperature setpoint controllerthat has been opTImized for use at elevated temperaturessuch as those found in oven control applicaTIons. The devicecold juncTIon compensates and amplifies a type J or K thermocoupleinput to derive an internal signal proporTIonal to temperature.The internal signal is then compared with an externallyapplied setpoint voltage to yield a low impedance switched outputvoltage. Dead-Band or switching hysteresis can be programmedusing a single external resistor. Alternately, the AD596/AD597 canbe configured to provide a voltage output (10 mV/°C) directly froma type J or K thermocouple signal. It can also be used as a standalonevoltage output temperature sensor.The AD596/AD597 can be powered with a single supply from+5 V to +30 V, or dual supplies up to a total span of 36 V.Typical quiescent supply current is 160 mA, which minimizesself-heating errors.The AD596/AD597 H package option includes a thermocouplefailure alarm that indicates an open thermocouple lead whenoperated in the temperature proportional measurement mode.The alarm output has a flexible format which can be used to drive relays, LEDs or TTL logic.
