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24bit reference design module promises accurate measurements

Posted: 18 Nov 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated Products? reference design? AFE? thermocouple? industrial automation?

Maxim Integrated Products Inc. has uncloaked the 24bit MAXREFDES67# analogue front end (AFE) universal input Micro PLC reference design that the company said allows industrial automation engineers to achieve highly accurate measurements for their system designs.

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# is a unique AFE reference design that overcomes this challenge, stated the company. Capable of accepting four different signals, the MAXREFDES67# universal analogue input requires no jumpers and is 100 per cent 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.

According to the company, the solution features effective resolution up to 22.3 bits with temperature error as low as ±0.1 per cent across a range of -40°C to 150°C; Beyond-the-Rails signal chain that reduces board space, component count and cost; and universal input that accepts four different signals: voltage, current, resistance temperature detector (RTD) and thermocouple (TC) .

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.

MAXREFDES67# reference block diagram

MAXREFDES67# reference block diagram

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