AD594ADZ

Overview

The AD594ADZ is a monolithic thermocouple amplifier with integrated cold junction compensation, designed for Type J thermocouples. It combines an ice point reference and a precalibrated amplifier to produce a high-level 10 mV/°C output directly from the thermocouple signal. The device features a low impedance voltage output and supports wide power supply ranges from +5 V to +15 V. It includes laser wafer trimming for ±18°C calibration accuracy and offers pin-strapping options for setpoint control or standalone Celsius thermometer operation.

Feature Summary

• Integrates a complete instrumentation amplifier and thermocouple cold junction compensator on a single monolithic chip
• Provides a high-level linear voltage output proportional to temperature without external signal conditioning
• Includes built-in ice point reference for automatic cold junction compensation
• Supports flexible configuration via pin-strapping for setpoint controller or standalone transducer modes

Applications

• Industrial process temperature monitoring systems
• Thermocouple-based heating and cooling controllers
• General purpose temperature measurement instrumentation

Procurement Notes

Verify the specific suffix 'ADZ' indicates RoHS compliance when sourcing. Confirm the package type matches the required board layout, as this part is available in side-brazed DIP or Cerdip configurations. Ensure the application utilizes Type J thermocouples, as the internal calibration is specific to this standard. Check for availability of evaluation documentation if system integration requires detailed pin-strapping guidance.

Selection Notes

Select this component when direct amplification and compensation of Type J thermocouples are required without complex external circuitry. It is suitable for applications needing a simple, low-power solution with a high-impedance differential input. Consider alternative models like the AD595 if Type K thermocouples are used instead. Evaluate the need for setpoint control features versus simple linear amplification based on system requirements.

Part Context

The AD594 series belongs to Analog Devices' family of thermocouple signal conditioners. These devices simplify temperature measurement by integrating functions that typically require multiple discrete components. The AD594ADZ specifically targets Type J thermocouples, offering a cost-effective alternative to multi-chip solutions while maintaining accuracy through factory laser trimming.

Replacement Considerations

The AD595ADZ serves as a functional substitute for Type K thermocouple applications, sharing the same package and interface characteristics but with different internal calibration.