AD594CDZ

Overview

The AD594CDZ 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 output directly from the thermocouple signal. The device features a low impedance voltage output of 10 mV/°C and operates on a wide power supply range. It includes laser wafer trimming for calibration accuracy and supports setpoint mode operation.

Feature Summary

• Integrates instrumentation amplifier and cold junction compensator on a single chip
• Provides direct high-level output compatible with standard data acquisition systems
• Supports flexible configuration including linear amplification and setpoint control modes

Applications

• Industrial temperature measurement systems requiring precise thermocouple signal conditioning
• Process control equipment utilizing Type J thermocouples
• Embedded temperature monitoring solutions needing integrated cold junction compensation

Procurement Notes

Verify the specific suffix CDZ indicates the ceramic DIP package variant when sourcing. Confirm that the component is intended for Type J thermocouples as specified in the datasheet. Ensure compatibility with the required power supply voltage range during system design. Check for current availability status as legacy components may have limited stock or end-of-life notifications.

Selection Notes

Select this component when a complete solution for Type J thermocouple amplification and cold junction compensation is required without external reference circuits. Consider the low power consumption and wide supply voltage range for battery-operated or industrial environments. Evaluate the need for setpoint control functionality if alarm or switching applications are part of the design requirements.

Part Context

The AD594 series belongs to Analog Devices' family of monolithic thermocouple amplifiers. It serves as a specialized interface between thermocouple sensors and downstream processing electronics. The device simplifies system design by eliminating the need for separate cold junction compensation circuitry and precision amplifiers typically required in temperature measurement applications.

Replacement Considerations

The AD595 is the primary alternative within the same product family, offering identical functionality but calibrated for Type K thermocouples instead of Type J. Verify thermocouple type compatibility before substitution. No other direct pin-to-pin replacements are documented for this specific model.