AD8494
Full J-Type Range 0° to 50° Thermocouple Amplifier w/Cold Junction Compensation
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Features
- Low cost and easy to use
- Pretrimmed for J type thermocouples
- Internal cold junction compensation
- High impedance differential input
- Standalone 5 mV/°C thermometer
- Reference pin allows offset adjustment
- Thermocouple break detection
- See data sheet for additional features.
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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
- Complete, precision laser wafer trimmed thermocouple signal conditioning system in a single IC package.
- Flexible pinout provides for operation as a setpoint controller or as a standalone Celsius thermometer.
- Rugged inputs withstand 4 kV ESD and provide over-voltage protection (OVP) up to
VS ± 25 V. - Differential inputs reject common-mode noise on the thermocouple leads.
- Reference pin voltage can be offset to measure 0°C on single supplies.
- Available in a small, 8-lead MSOP that is fully RoHS compliant.
Applications
- J 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
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
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Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
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AD8494
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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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD8494ARMZ |
8-Lead MSOP
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| AD8494ARMZ-R7 |
8-Lead MSOP
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| AD8494CRMZ |
8-Lead MSOP
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| AD8494CRMZ-R7 |
8-Lead MSOP
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- AD8494ARMZ
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8-Lead MSOP
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HTML
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Ultra Librarian
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SamacSys
- AD8494ARMZ-R7
- Pin/Package Drawing
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8-Lead MSOP
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- AD8494CRMZ
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- AD8494CRMZ-R7
- Pin/Package Drawing
-
8-Lead MSOP
- Documentation
-
HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
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Part Models
Product Lifecycle
PCN
May 10, 2023
- 22_0142
Qualification of an Alternate Wafer Fab for High Voltage Bipolar Products (HVBIP) to Analog Devices, Inc. Wilmington MA
AD8494ARMZ
PRODUCTION
AD8494ARMZ-R7
PRODUCTION
AD8494CRMZ
PRODUCTION
AD8494CRMZ-R7
PRODUCTION
Oct 26, 2015
- 15_0176
Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines
AD8494ARMZ
PRODUCTION
AD8494ARMZ-R7
PRODUCTION
AD8494CRMZ
PRODUCTION
AD8494CRMZ-R7
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
May 10, 2023
- 22_0142
Qualification of an Alternate Wafer Fab for High Voltage Bipolar Products (HVBIP) to Analog Devices, Inc. Wilmington MA
AD8494ARMZ
PRODUCTION
AD8494ARMZ-R7
PRODUCTION
AD8494CRMZ
PRODUCTION
AD8494CRMZ-R7
PRODUCTION
Oct 26, 2015
- 15_0176
Assembly Transfer of Select 8/10L MSOP Products to Amkor Philippines
AD8494ARMZ
PRODUCTION
AD8494ARMZ-R7
PRODUCTION
AD8494CRMZ
PRODUCTION
AD8494CRMZ-R7
PRODUCTION
Evaluation Kits 1
EVAL-AD8494
AD8494 Evaluation Board
Product Detail
This user guide is a description of functionality for the AD8494 series evaluation board. The evaluation board can be configured for the AD8494, AD8495, AD8496, and AD8497 to ensure that the metals and alloys are properly matched for the thermocouple type for which the device is trimmed. The 4-layer evaluation board is designed to allow users to quickly prototype the precision thermocouple amplifiers for various user defined configurations for different applications. The evaluation board has three modes of operation: linear mode, setpoint controller mode, and hysteresis on setpoint controller mode.
The AD8494/AD8495/AD8496/AD8497 data sheet is available at www.analog.com. This data sheet provides additional information on the AD8494, AD8495, AD8496, and AD8497 and must be consulted in conjunction with this user guide when using the evaluation board.
Resources
Evaluation Kits1
Tools & Simulations 1
SPICE Model 1
SPICE Model
