AD595CD

Overview

The AD595CD 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 high-level output of 10 mV/°C directly from the thermocouple signal. The device features laser wafer trimming for calibration accuracy, a built-in thermocouple failure alarm with TTL drive capability, and flexible pin-strapping options for setpoint control or standalone Celsius transducer operation. It operates on a wide power supply range from +5 V to dual supplies spanning 30 V.

Feature Summary

• Integrates instrumentation amplification, cold junction compensation, and output buffering in a single package.
• Includes a thermocouple failure alarm that detects open leads and provides a flexible format output with TTL drive capability.
• Supports operation as a linear amplifier-compensator or a switched output setpoint controller using fixed or remote setpoints.
• Features high impedance differential input to reject common-mode noise on thermocouple leads.

Applications

• Direct temperature measurement systems requiring cold junction compensation
• Setpoint temperature controllers with fixed or remote setpoint control
• Standalone Celsius thermometer applications

Procurement Notes

Verify the specific suffix 'CD' corresponds to the Cerdip (Q-14) package option as listed in the datasheet. Confirm the component grade matches the required calibration accuracy specifications for your application. Ensure the ordering information aligns with Analog Devices Inc. manufacturing standards. Cross-reference the part number with official distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select the AD595CD specifically for applications involving Type K (chromel-alumel) thermocouples. The device is pretrimmed for these inputs, offering higher accuracy than generic amplifiers. Consider the wide supply voltage range and low power consumption for battery-operated or remote sites. Verify that the hermetically sealed ceramic package meets environmental requirements for the installation site.

Part Context

The AD595CD belongs to the AD594/AD595 family of monolithic thermocouple amplifiers. While the AD594 is calibrated for Type J thermocouples, the AD595 is laser trimmed for Type K inputs. Both devices share identical functional architectures, including integrated cold junction compensation and alarm outputs, differing primarily in their gain settings and calibration offsets to match specific thermocouple characteristics.

Replacement Considerations

The AD594CD serves as a functional substitute within the same family but is calibrated for Type J thermocouples rather than Type K. Direct replacement requires recalibration or acceptance of Type K measurement errors. No other direct cross-model replacements are documented in the provided source material.