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ADC8494

Analog Devices
Part Number ADC8494
Manufacturer Analog Devices
Description (ADC8494 - ADC8497) Precision Thermocouple Amplifiers
Published Oct 1, 2013
Detailed Description Precision Thermocouple Amplifiers with Cold Junction Compensation AD8494/AD8495/AD8496/AD8497 FEATURES Low cost and easy...
Datasheet PDF File ADC8494 PDF File

ADC8494
ADC8494

Overview
Precision Thermocouple Amplifiers with Cold Junction Compensation AD8494/AD8495/AD8496/AD8497 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 FUNCTIONAL BLOCK DIAGRAM REF +IN ESD AND OVP AD8494/AD8495/ AD8496/AD8497 A2 THERMOCOUPLE COLD JUNCTION COMPENSATION A3 OUT –IN 1MΩ ESD AND OVP A1 SENSE Figure 1.
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 Table 1.
Device Temperature Ranges ThermoCouple Type J K J K Optimized Temperature Range Ambient Temperature Measurement (Reference Junction) Junction 0°C to 50°C Full J type range 0°C to 50°C Full K type range 25°C to 100°C Full J type range 25°C to 100°C Full K type range Part No.
AD8494 AD8495 AD8496 AD8497 GENERAL DESCRIPTION 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 selfheating, an unloaded AD849x typically operates with a total...


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