AD594CD/+

Overview

The AD594CD/+ is a monolithic thermocouple amplifier with integrated cold junction compensation, designed for Type J thermocouples. It combines an ice point reference with a precalibrated amplifier to produce a high-level 10 mV/°C output directly from the thermocouple signal. The device features laser wafer trimming for ±3°C calibration accuracy and includes a thermocouple failure alarm. It operates on a wide power supply range of +5 V to +15 V with low power consumption typically under 1 mW. The component is housed in an 8-lead CERDIP package.

Feature Summary

• Integrates instrumentation amplifier and cold junction compensator on a single chip
• Provides direct linear voltage output proportional to temperature
• Includes built-in thermocouple failure detection capability
• Supports setpoint mode operation for control applications

Applications

• Industrial process temperature monitoring
• HVAC system thermal regulation
• Scientific instrumentation requiring precise thermocouple interfacing

Procurement Notes

Verify the specific suffix designation against the manufacturer's current datasheet revision to confirm pinout compatibility and electrical specifications. Ensure the procurement channel provides original manufacturer documentation to validate the ceramic DIP packaging integrity and laser trim accuracy claims.

Selection Notes

Select this component when a complete thermocouple signal conditioning solution is required without external compensation circuitry. It is suitable for applications needing a linear Celsius output and built-in fault detection. Consider the operating temperature range and power supply constraints relative to the system environment.

Part Context

This part belongs to Analog Devices' family of monolithic thermocouple amplifiers, which also includes the AD595 for Type K thermocouples. These devices simplify temperature measurement systems by integrating signal conditioning functions that would otherwise require multiple discrete components, reducing board space and design complexity.

Replacement Considerations

The AD595 serves as a functional substitute for Type K thermocouple applications, sharing the same package and interface characteristics but calibrated for different thermocouple types.