Simplifying Design of Analog Input Modules for Process Control
●When designing analog input modules for process control applications such as programmable logic controller (PLC) or distributed control system (DCS) modules, the main trade-off considered is usually performance vs. cost. A tradition exists in this application space of using bipolar ±15 V rails to supply active front-end components that are used to attenuate or gain input signals. This impacts the cost of bill of materials (BOM), as well as adding to the complexity of the design with the creation of the isolated bipolar supplies. To save on costs, an alternative approach is to architect with a single 5 V supply. The single 5 V rail greatly reduces the complexity of the design of the isolated supply for the analog front ends. However, it can introduce other pain points and may result in a lower accuracy measurement solution. The AD4111 takes on a lot of the integration needed for voltage and current measurements, and addresses the limitations of a 5 V supply solution
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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DN21111-0-3/19 |
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