AD597AH Analog Devices Integrated Circuit (Other) In Stock
AD597AH is a monolithic Type-J thermocouple amplifier and cold-junction compensator from Analog Devices, producing a calibrated 10 mV/°C analog output voltage directly from a J-type thermocouple pair without external components. It achieves ±4°C total accuracy over a 0°C to +300°C measurement range with ±15 V dual-supply operation in a 10-pin metal can (TO-100) package. Designed for temperature measurement instrumentation, industrial process controllers, and laboratory equipment.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 10
- Lifecycle
- OBSOLETE
- Datasheet
- AD597AH Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of AD597AH?
- Integrated cold-junction compensation eliminates the need for isothermal terminal blocks or separate reference sensors
- Calibrated 10 mV/°C output for direct interface to ADCs or analog meters without gain stages
- ±4°C maximum accuracy over 0°C to +300°C thermocouple measurement span
- Supports ±2.5 V to ±15 V dual-supply operation for flexible system power rails
- 10-pin metal-can TO-100 package provides hermetic sealing for harsh industrial environments
What is AD597AH used for?
The AD597AH simplifies thermocouple-based temperature measurement by combining amplification and cold-junction compensation in a single IC, making it ideal for industrial process controllers measuring temperatures from 0°C to 300°C with a Type-J thermocouple. It is used in laboratory ovens, plastic extrusion equipment, and HVAC systems where a direct 10 mV/°C analog voltage output drives panel meters or 12-bit ADC inputs without additional signal conditioning. The hermetic TO-100 metal package also suits medical sterilization equipment and aerospace ground-support instrumentation.
What are the specifications of AD597AH?
| Source Url Status Check Date | 2013-05-01 14:56:15.089 |
| Pbfree Code | No |
| YTEOL | 0 |
| Analog IC - Other Type | ANALOG CIRCUIT |
| JESD-30 Code | O-MBCY-W10 |
| JESD-609 Code | e0 |
| Neg Supply Voltage-Max (Vsup) | -15 V |
| Neg Supply Voltage-Min (Vsup) | -2.5 V |
| Neg Supply Voltage-Nom (Vsup) | -5 V |
| Number of Functions | 1 |
| Package Body Material | METAL |
| Package Shape | ROUND |
| Package Style | CYLINDRICAL |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 15V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Temperature Grade | MILITARY |
| Terminal Finish | TIN LEAD |
| Terminal Form | WIRE |
| Terminal Position | BOTTOM |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.01 |
Where can I find the AD597AH datasheet?
AD597AH Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for AD597AH?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the AD597AH handle cold-junction compensation for a Type-J thermocouple, and what accuracy does it achieve?
The AD597AH contains an on-chip temperature sensor that continuously measures the ambient temperature at the thermocouple terminals and subtracts this reading from the thermocouple signal, effectively performing cold-junction compensation internally. The result is a calibrated 10 mV/°C output representing the actual process temperature. Maximum total error is ±4°C over a measurement span of 0°C to +300°C, making it accurate enough for most industrial process-control applications without additional trimming or external compensation circuits.
What supply voltage does the AD597AH require, and can it operate from a single 5 V rail?
The AD597AH requires a dual supply, with the negative rail ranging from -2.5 V to -15 V and the positive rail up to +15 V; a nominal ±5 V or ±15 V dual supply is typical. Single-supply operation at 5 V is not supported because the internal op-amp topology needs both positive and negative rails to generate a 0 V output for 0°C thermocouple input. Designers requiring single-supply operation should use the AD8495 or similar rail-to-rail alternatives instead.
For a plastic extrusion machine monitoring temperatures up to 250°C, how should the AD597AH output be connected to a microcontroller ADC?
At 250°C the AD597AH produces a 10 mV/°C × 250°C = 2.5 V analog output, which falls within the input range of a 3.3 V or 5 V ADC. A 12-bit ADC with a 3.3 V reference provides approximately 0.81 mV/LSB resolution, corresponding to about 0.08°C per count—well below the ±4°C device accuracy. Connect the output pin directly through a 100 Ω series resistor and 10 nF filter capacitor to the ADC input to suppress high-frequency noise before sampling.
When would a designer choose the AD597AH over a digital thermocouple interface IC such as the MAX31855?
The AD597AH is preferred when an analog output voltage is directly needed—for example, to drive an analog PID controller, a panel meter, or a legacy 4–20 mA transmitter—since it outputs a continuous 10 mV/°C signal without requiring SPI communication or a microcontroller. The MAX31855 provides a 14-bit digital output over SPI and is better for microcontroller-based systems, while the AD597AH suits analog control loops operating up to 300°C where the ±4°C accuracy and 10 mV/°C slope are sufficient.
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Why Buy from FindMyChip
About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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