Precision, high-performance A/D converters demand additional technical attention when it comes to interfacing and signal conditioning for various sensor types — unlike more common converters. These extra steps help unlock their full potential. Let’s explore the AD7124!

The AD7124 ADC

This article aims to propose practical applications where it can be seen how the special features of the AD7124 ADC by Analog Devices allow the signals coming from different types of sensors to be conditioned to obtain a precise and efficient measurement. Through the following case-of-use examples, the operation of these characteristics is explained, and how they help to achieve an efficient measurement system.

Case 1: pH Sensor

The output of the pH sensor is bipolar and gives a maximum signal of ±414 mV at 25°C. The AD7124 operates from a single power supply (AVDD = 3.3 V); therefore, the pH probe should be biased above ground so that it is within the acceptable common-mode range of the AD7...