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
Key Features
- 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
Applications
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.
Specifications
| 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 |
Alternate & Equivalent Parts
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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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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