The AD594/AD595 is an integrated temperature sensor with cold junction compensation, which can be used with Type J, Type K and Type T thermocouples. It combines an ice point reference with a precalibrated amplifier to produce a high level (10 mV/°C) output directly from a thermocouple signal. Pin-strapping options allow it to be used as a linear amplifier-compensator or as a switched output setpoint controller using either fixed or remote setpoint control. It can be used to amplify its compensation voltage directly, thereby converting it to a stand-alone Celsius transducer with a low impedance voltage output. The AD594/AD595 includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open. The alarm output has a flexible format which includes TTL driver output, integrated circuit driver output and passive decoder output.
The AD594 and AD595 are monolithic thermocouple amplifiers that integrate cold‑junction compensation, high‑gain amplification, and a low‑impedance voltage output (10 mV/°C). They are laser‑trimmed for Type J (AD594) or Type K (AD595) thermocouples and can also be configured for other thermocouple types through external recalibration.
The devices operate from a wide supply range, support both single‑supply (+5 V) and dual‑supply configurations, and include a thermocouple failure alarm. Key specifications such as power‑supply range, quiescent current, calibration error, and operating temperature range are listed in the specification tables.
| Power Consumption | <1 mW typical |
|---|---|
| Operating Temperature Range | –55 °C to +125 °C |
| Calibration Error (typical at +25 °C) | 1.63 °C |
The device includes an internal ice‑point reference and a precalibrated amplifier that together provide cold‑junction compensation.
Yes, it can operate from a single +5 V supply.