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AD8497ARMZ-R7 Datasheet(PDF) 1 Page - Analog Devices |
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AD8497ARMZ-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page Precision Thermocouple Amplifiers with Cold Junction Compensation AD8494/AD8495/AD8496/AD8497 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Low cost and easy to use Pretrimmed for J or K type thermocouples Internal cold junction compensation High impedance differential input Standalone 5 mV/°C thermometer Reference pin allows offset adjustment Thermocouple break detection Laser wafer trimmed to 1°C initial accuracy and 0.025°C/°C ambient temperature rejection Low power: <1 mW at VS = 5 V Wide power supply range Single supply: 2.7 V to 36 V Dual supply: ±2.7 V to ±18 V Small, 8-lead MSOP APPLICATIONS J or 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 FUNCTIONAL BLOCK DIAGRAM +IN –IN OUT REF A1 A2 AD8494/AD8495/ AD8496/AD8497 A3 SENSE ESD AND OVP ESD AND OVP COLD JUNCTION COMPENSATION 1M Ω THERMO- COUPLE Figure 1. Table 1. Device Temperature Ranges Part No. Thermo- couple Type Optimized Temperature Range Ambient Temperature (Reference Junction) Measurement Junction AD8494 J 0°C to 50°C Full J type range AD8495 K 0°C to 50°C Full K type range AD8496 J 25°C to 100°C Full J type range AD8497 K 25°C to 100°C Full K type range GENERAL DESCRIPTION The AD8494/AD8495/AD8496/AD8497 are precision instrumen- tation 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 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. |
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