Analog Devices / Maxim Integrated MAXREFDES12 Corona Reference Design

Analog Devices Inc. MAXREFDES12 Corona Reference Design provides the front-end interface circuit of a programmable logic controller (PLC) digital input module. The serialization feature greatly reduces the number of optocouplers used for isolation. The reference design accepts high-voltage inputs (36V, max) and features isolated power and data—all integrated into a small form factor. The Corona design combines an octal, digital input translator/serializer (MAX31911), a data isolation device (MAX14850), and an H-bridge transformer driver for an isolated power supply (MAX13256). The Corona digital input circuit solution mainly targets digital input modules for PLCs, industrial automation, process automation, and motor control applications.