TIDUEM8B March   2019  – February 2021

 

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2.3.1.4 Analog Inputs

The analog front end in this design consists of the ADS131M04 delta sigma standalone ADC. Each of the ADS131M04 converters is differential and requires that the input voltages at the pins does not exceed ±1.2 V (gain = 1). To meet this input voltage specification, the current and voltage inputs must be divided down. In addition, the ADS131M04 device can sense voltages down to −1.2 V; therefore, AC signals from mains can be directly interfaced without the need for level shifters. This subsection describes the analog front end used for voltage and current channels.