• Home
  • Parts Library
  • AD8495 Amplifiers Introduction

    Figure 1 AD8495ARMZ

    Figure 2 Pin Configuration

    Figure 3 Functional Block Diagram

    WHAT IS AD8495ARMZ ?

    The AD8495ARMZ is an instrumentation amplifier with thermocouple cold junction compensator on an integrated circuit. The effects of temperature change on dissimilar metals (Thermocouple) produces a measurable voltage. But to make that measurement you need an amplifier circuit (A8495ARMZ) designed for the thermocouple being used.  This device incorporates precision instrumentation amplifiers provide an amplified output directly from a type J or K thermocouples. The AD8495ARMZ can be powered from a single-ended supply and can measures temperature below 0°C. They can be used as a thermometers or as switched output setpoint controllers.

    PINOUT DISCRIPTION

    Table 1 PIN Configuration

    PIN NO. LABLE DESCRIPTION
    1 -IN Connect this pin with -Ve terminal of thermocouple
    2 REF Reference
    3 VS -Ve Supply
    4 NC No Connect (Floating)
    5 SENSE Sense Pin
    Measurement Mode Connect to Output
    Setpoint Mode Connect to Setpoint Voltage
    6 OUT Output
    7 +VS Positive Supply
    8 +IN Connect this pin with +Ve terminal of thermocouple

     ABSOLUTE MAXIMUM RATINGS*

    PARAMETER VALUE
    Supply Voltage ±18 V
    Maximum Voltage at −IN or +IN −VS + 25 V
    Minimum Voltage at −IN or +IN +VS − 25 V
    REF Voltage ±VS
    Operating Temperature Range −40°C to +125°C
    Maximum IC Junction Temperature 140°C

    *Operation beyond the maximum operating conditions for extended periods may affect product reliability.

    FEATURES

    • Low cost
    • Easy to operate
    • suitable for J or K type thermocouples
    • Internal cold junction compensation (for monitoring changes in cold junction)
    • High impedance differential input
    • Can be used as Thermometer
    • offset adjustment
    • Thermocouple break detection
    • Laser wafer trimmed to 1°C initial accuracy
    • ambient temperature rejection
    • Low power consumption
    • Wide power supply range
    • Single supply: 2.7 V to 36 V
    • Dual supply: ±2.7 V to ±18 V

    ALTERNATIVES FOR AD8495ARMZ

    Table 2 equivalent for AD8495

    IC NUMBER THERMOCOUPLE

    TYPE

    TEMPRATURE RANGE
    REFERENCE JUNCTION MEASUREMENT JUNCTION
    AD8495 K 0°C to 50°C Full K type range
    AD8494 J 0°C to 50°C Full J type range
    AD8496 J 25°C to 100°C Full J type range
    AD8497 K 25°C to 100°C Full K type range

     APPLICATION | FUNCTION

    • 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

    HOW TO USE AD8495ARMZ ? | Working of AD8495ARMZ

    Fig.4 Shows connection of AD8495 with K type thermocouple. A filter at the input is recommended to remove high frequency noise. The 1 MΩ resistor to ground enables open thermocouple detection and proper grounding of the thermocouple. The sense pin should be connected to the output pin of the AD8495. Decoupling capacitors should be used to ensure clean power supply voltages on +VS and, if using dual supplies, on −VS, also. A 0.1 μF capacitor should be placed as close as possible to each AD8495 supply pin. A 10 μF tantalum capacitor can be used farther away from the part and can be shared.

    Figure 4 Connection for AD8495

    Figure 5 Connection for AD8495

     

    2D-VIEW AND FOOTPRINT

    View and PCB Footprint of AD8495ARMZ

    Figure 6 2-D View and PCB Footprint of AD8495ARMZ

    AD8495 RELATED PRODUCTS PRICE

    PartsMfr.DescriptionStockPricesBuy Now
    AD8495ARMZAnalogIC THERMOCOUPLE A W/COMP 8MSOP26894$2.390 Lowest
     AD8495ARMZAnalogIC THERMOCOUPLE21896$2.390 Lowest
     AD8497ARMZAnalog Thermocouple Amplifiers6$4.696 Lowest

    AD8495ARMZ DATASHEET PDF

    COMMENTS

    WORDPRESS: 0
    DISQUS: 1