Maxim reference design applies 24-bit signal chain to industrial sensors

November 17, 2015 // By Graham Prophet
Industrial automation engineers can achieve highly accurate measurements for their system designs with the MAXREFDES67# analogue front end (AFE) universal input Micro PLC reference design from Maxim Integrated Products.

As high-resolution systems move to higher bit counts, they become more sensitive to noise, making such systems difficult to build and maintain accuracy. MAXREFDES67#, Maxim says, is a 24-bit AFE reference design that overcomes this challenge. Capable of accepting four different signals, the universal analogue input requires no jumpers and is 100% software configurable.

To meet Industry 4.0 requirements, Maxim partnered with Wurth Electronics Midcom to customise a power isolation transformer that is energy efficient and compact enough to fit in Maxim's credit-card sized Micro PLC form factor.

The design yields high accuracy: effective resolution up to 22.3 bits with temperature error as low as ±0.1% across a range of -40 to +150C. The design supports beyond-the-rails operation and reduces board space, component count, and cost. Its universal input accepts four different signals; voltage, current, resistance temperature detector (RTD), and thermocouple (TC).

“MAXREFDES67 is by far the highest performance analogue reference design that Maxim has ever built,” said David Andeen, Director of Reference Designs at Maxim Integrated. “It also features a complete Beyond the Rails signal chain, enabling the entire system to process inputs in excess of the bias voltages for each component.”

The MAXREFDES67# reference design is available for $99 at Maxim's website and select franchised distributors. Hardware and firmware design files, as well as test data, are provided free and available online;  http://bit.ly/MAXREFDES67

Other Maxim reference designs are at; http://bit.ly/ReferenceDesigns

Maxim Integrated; www.maximintegrated.com