Analog Devices / Maxim Integrated MAX31911 Interface Translator/Serializers

Analog Devices Inc. MAX31911 Interface Translator/Serializers are an industrial interface serializer that translates, conditions, and serializes the 24V digital output of sensors and switches. These devices are used in industrial, process, and building automation to 5V CMOS-compatible signals required by microcontrollers. These provide the front-end interface circuit of a programmable logic controller (PLC) digital input module. The ADI MAX31911 features integrated current limiting, low-pass filtering, and channel serialization. Input current limiting allows a significant reduction in power consumed from the field voltage supply as compared to traditional discrete resistor-divider implementations. The device serializer is stackable so that any number of input channels can be serialized and output through only one SPI-compatible port. This feature reduces the number of optocouplers needed to only three, regardless of the number of input channels.