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AD597:  Type K Thermocouple Conditioner and Setpoint Controller

Product Details

Newer Alternatives:
    AD8497: 8-lead MSOP with 5mV/C output, single supply operation and improved accuracy for K type thermocouples.

The AD596/AD597 is a monolithic temperature setpoint controller which has been optimized for use at elevated temperatures such as those found in oven control applications. The device cold junction compensates and amplifies a type J or K thermocouple input to derive an internal signal proportional to temperature. The internal signal is then compared with an externally applied setpoint voltage to yield a low impedance switched output voltage. Dead-Band or switching hysteresis can be programmed using a single external resistor. Alternately, the AD596/ AD597 can be configured to provide a voltage output (10 mV/°C) directly from a type J or K thermocouple signal. It can also be used as a stand-alone voltage 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 µA which minimizes self-heating errors.

The AD596/AD597 H package option includes a thermocouple failure alarm that indicates an open thermocouple lead when operated in the temperature proportional measurement mode. The alarm output has a flexible format which can be used to drive relays, LEDs or TTL logic.

The device is packaged in a reliability qualified, cost effective 10-pin metal can, 8-pin plastic mini-DIP or SOIC and is trimmed to operate over an ambient temperature range from +25°C to +100°C. Operation over an extended ambient temperature range is possible with slightly reduced accuracy. The AD596 will amplify thermocouple signals covering the entire -200°C to +760°C temperature range recommended for type J thermocouples while the AD597 can accommodate -200°C to +1250°C type K inputs.

The AD596/AD597 has a calibration accuracy of ±4°C at an ambient temperature of 60°C and an ambient temperature stability specification of 0.05°C/°C from +25°C to +100°C. If higher accuracy, or a lower ambient operating temperature is required, either the AD594 (J thermocouple) or AD595 (K thermocouple) should be considered.


  • Operates with Type J (AD596) or Type K (AD597) Thermocouples
  • Built-In Ice Point Compensation
  • Temperature Proportional Operation – 10 mV/°C
  • Low Cost
  • Temperature Setpoint Operation – ON/OFF
  • Programmable Switching Hysteresis
  • High Impedance Differential Input

Typical Application Circuit for AD597


Title Content Type File Type
AD596/AD597: Thermocouple Conditioner and Setpoint Controller Data Sheet  (Rev B, 02/1998) (pdf, 202 kB) Data Sheets PDF
Design Techniques for reducing power consumption and harmful thermal events in industrial designs
This webcast will present: typical analog module configuration and show how to calculate the maximum ambient temperature that the system can tolerate, new technology to reduce the power dissipated in the module (regardless of what output load is connected), then look at the performance of these devices when the supply is run from a switching regulator rather than with a linear regulator.
Webcasts WEBCAST
ADT7301: Accurate, SPI-Compatible Temperature Sensor in SOT Package  (htm)
(analogZone September 1, 2003)
Product Reviews HTM
Selection Guide: Temperature Sensors  (pdf, 807 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
This tool will calculate output voltage based on thermocouple type and temperature for the AD594/AD595 thermocouple amplifiers.
ADIsim Design/Simulation Tools HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD597 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD597AH Status: Last Time Buy ROUND HEADER/METAL CAN 10 Ind Tube, 100 $13.81 $11.11 N  Material Info PCN/PDN Purchase
AD597AHZ Status: Production ROUND HEADER/METAL CAN 10 Ind Tube, 100 $12.49 $10.06 Y  Material Info PCN Purchase
AD597ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.41 $2.84 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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