AD8497

Full K-Type Range 25° to 100° Thermocouple Amplifier w/Cold Junction Compensation
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Product Details

The AD8494/AD8495/AD8496/AD8497 are precision instrumentation amplifiers with thermocouple cold junction compensators on an integrated circuit. They produce a high level (5 mV/°C) output directly from a thermocouple signal by combining an ice point reference with a precalibrated amplifier. They can be used as standalone thermometers or as switched output setpoint controllers using either a fixed or remote setpoint control.

The AD8494/AD8495/AD8496/AD8497 can be powered from a single-ended supply (less than 3 V) and can measure temperatures below 0°C by offsetting the reference input. To minimize self-heating, an unloaded AD849x typically operates with a total supply current of 180 μA, but it is also capable of delivering in excess of ±5 mA to a load.

The AD8494 and AD8496 are precalibrated by laser wafer trimming to match the characteristics of J type (iron-constantan) thermocouples; the AD8495 and AD8497 are laser trimmed to match the characteristics of K type (chromel-alumel) thermo-couples. See Table 1 on the data sheet for the optimized ambient temperature range of each part.

The AD8494/AD8495/AD8496/AD8497 allow a wide variety of supply voltages. With a 5 V single supply, the 5 mV/°C output allows the devices to cover nearly 1000 degrees of a thermo-couple’s temperature range.

The AD8494/AD8495/AD8496/AD8497 work with 3 V supplies, allowing them to interface directly to lower supply ADCs. They can also work with supplies as large as 36 V in industrial systems that require a wide common-mode input range.

Product Highlights

  1. Complete, precision laser wafer trimmed thermocouple signal conditioning system in a single IC package.
  2. Flexible pinout provides for operation as a setpoint controller or as a standalone Celsius thermometer.
  3. Rugged inputs withstand 4 kV ESD and provide over-voltage protection (OVP) up to VS ± 25 V.
  4. Differential inputs reject common-mode noise on the thermocouple leads.
  5. Reference pin voltage can be offset to measure 0°C on single supplies.
  6. Available in a small, 8-lead MSOP that is fully RoHS compliant.


Applications

      • K type thermocouple temperature measurement
      • Setpoint controller
      • Celsius thermometer
      • Universal cold junction compensator
      • White goods (oven, stove top) temperature measurements
      • Exhaust gas temperature sensing
      • Catalytic converter temperature sensing

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD8497 Material Declaration
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Overview

3 Reviews
2 out of 3 (66%) customers recommend this product.
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Most Helpful Review

by Anonymous
I need to detect a small diferential mode signal composed of two large common mode signals. I used an ordinary amplifier but large noise was included. The AD8497 help to solve it perfectly.

Most Recent Review

by Anonymous
The AD8496 thermocouple interface IC handles all of the challenges associated with thermocouple interfacing neatly, efficiently, and most importantly, cost effectively.

All Reviews

by Anonymous, 11 Sep 14
Thermocouple Interface IC
The AD8496 thermocouple interface IC handles all of the challenges associated with thermocouple interfacing neatly, efficiently, and most importantly, cost effectively.
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by echen1024, 26 May 14
Easy to use, very powerful
The AD8497 Thermocouple amplifier is a brilliant device. It is easy to use for a basic setup, but many more features can be implemented if you wish to do so. A large improvement over the old AD595
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by Anonymous, 12 Mar 14
application in grid-connected inverter system
I need to detect a small diferential mode signal composed of two large common mode signals. I used an ordinary amplifier but large noise was included. The AD8497 help to solve it perfectly.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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