AD595AQ

Overview

The AD595AQ is a monolithic thermocouple amplifier and cold junction compensator designed for Type K inputs. It integrates an ice point reference with a precalibrated amplifier to produce a linear 10 mV/°C output directly from the thermocouple signal. The device features built-in failure detection, setpoint control capability, and operates on single or dual supplies ranging from +5 V to ±15 V. Laser wafer trimming ensures high calibration accuracy.

Feature Summary

• Monolithic integration of instrumentation amplifier and cold junction compensation
• Laser-wafer trimmed for Type K thermocouple characteristics
• Integrated thermocouple open-circuit alarm with TTL drive capability
• Flexible pinout supporting linear amplification or switched setpoint control

Applications

• Industrial temperature monitoring systems
• HVAC sensor interfaces
• Process control instrumentation
• Stand-alone Celsius transducers

Procurement Notes

Verify package integrity upon receipt; ensure storage conditions match manufacturer specifications. Confirm that the ordering suffix corresponds to the required performance grade and packaging option. Cross-reference the part number against the official Analog Devices datasheet to validate functional compatibility before integration into design schematics.

Selection Notes

Select this component when direct conditioning of Type K thermocouples is required without external compensation circuitry. Consider the A-grade specification for tighter calibration tolerances compared to the C-grade. Evaluate supply voltage requirements, as dual supplies enable negative temperature measurement while single supplies simplify power architecture.

Part Context

This component belongs to the AD594/AD595 family of complete thermocouple conditioners. These devices are engineered to replace discrete amplifier and compensation networks, reducing board space and complexity. The family supports both Type J and Type K inputs, providing a standardized solution for precision temperature sensing applications across various industrial sectors.

Replacement Considerations

Direct substitutes include the AD594AQ for Type J thermocouple applications. Verify pin compatibility and thermal characteristics when replacing legacy components. Ensure recalibration procedures are available if adapting the device for non-standard thermocouple types.