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[Solicitation] PT100 amplifier using AD623

Overview

This project is used to verify the PT100 bridge amplifier solution verification design of Lichuang Mall instrument amplifier AD623.

AD623 is a precision instrumentation amplifier IC, available in SMD and direct plug versions. PT100 is a precision PTC platinum thermal resistor, its resistance changes with temperature approximately linearly ==========The following solution method comes from Baidu Know========== 1. According to The Vedic formula is used to calculate the conversion formula for Rt ->t with resistance greater than or equal to 100 ohms : 0≤t<850℃ t=(sqrt((A*R0)^2-4*B*R0*(R0-Rt) )-A*R0)/2/B/R0 Rt is the resistance value at t℃, R0 is the resistance value at 0℃. A, B, and coefficients in the formula are experimentally determined. DIN IEC751 coefficient: A=3.9083E-3, B=-5.775E-7, C=-4.183E-12

2. The evaluation formula of R0 and Rt (1) -200<t<0℃ Rt=R0[1+At+Bt*t+C(t-100)t*t*t] (2) 0≤t< 850℃ Rt=R0 (1+At+Bt2) DIN IEC751 coefficient in the formula: A=3.9083E-3, B=-5.775E-7, C=-4.183E-12

See the schematic page for more instructions.

Design Files

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Update:2025-06-23 08:01:29

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