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Применения > > Fully Isolated Input Module Based on the AD7793 24-Bit ОЈ-О” ADC, the ADuM5401 Digital Isolator, and a High Performance In-Amp

Fully Isolated Input Module Based on the AD7793 24-Bit ОЈ-О” ADC, the ADuM5401 Digital Isolator, and a High Performance In-Amp (CN0067)

This circuit provides a complete solution for an industrial control input module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control system (DCS) modules that must digitize standard 4 mA to 20 mA current inputs and unipolar input voltage ranges. The AD8220 in-amp is used to level shift the bipolar signals to provide a 0 V to 5 V input signal to the AD7793 ADC. The ADuM5401 provides all the necessary signal isolation and power between the microcontroller and the ADC. The circuit also includes standard external protection and has been tested and verified to be fully compliant with IEC 61000 specifications.



Figure 1. 24-Bit Isolated Industrial Control Voltage Input Module (Simplified Schematic)

Возможности

  • Industrial Control Input Module
  • 4mA to 20mA Current Inputs and Unipolar Input Voltage
  • 24-Bits of Digitally Isolated Resolution

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