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Analog Devices CN-0545 Integrated 0.1°C Thermistor Measurement System

Precision 0.1°C thermistor measurement system using AD7124-4/AD7124-8 24-bit sigma-delta ADCs and ADP150 LDO. Optimized for low-power, high-accuracy temperature sensing.

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Overview

The CN-0545 is a reference design from Analog Devices featuring a completely integrated thermistor measurement system with 0.1°C accuracy. It utilizes the AD7124-4 or AD7124-8 low-noise, 24-bit sigma-delta ADCs to achieve high resolution and 50 Hz/60 Hz noise rejection. The design employs a ratiometric measurement configuration with a high-precision sense resistor and a constant excitation voltage to eliminate errors from the excitation source. The circuit supports NTC thermistors and includes linearization techniques such as the Steinhart-Hart equation. With multiple power modes, including a low-power mode consuming 255 µA, the system is suitable for battery-operated and loop-powered applications.

Use Cases

  • Industrial automation
  • Medical instrumentation
  • Battery-powered temperature monitoring
  • Manufacturing process control
  • Transit and logistics temperature tracking

Topics

Analog Devices
AD7124-4
AD7124-8
CN-0545
thermistor
NTC
24-bit ADC
sigma-delta ADC
ADP150
temperature measurement
ratiometric
low power

Referenced Parts

AD7124-4

Analog Devices

AD7124-4/ AD7124-8 4-Channel/8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADCs with PGA and Reference

AD7124-8

Analog Devices

AD7124-4/ AD7124-8 4-Channel/8-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADCs with PGA and Reference

ADP150

Analog Devices

ADP150 Ultralow Noise, 150 mA CMOS Linear Regulator

44031

Omega Engineering

For the circuit in Figure 1, a 10 kΩ, Type 44031 NTC thermistor sensor was used

Analog Devices CN-0545 Integrated 0.1°C Thermistor Measurement System | Design Resources