FRESNO (MAXREFDES11#): 16-bit, high-precision, 0 to 10V input, isolated analog front end (AFE)

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Low-resolution and low-input-voltage analog-to-digital converters (ADCs) are integrated into many of today's field-programmable gate arrays (FPGAs) and microcontrollers . However, these ADCs cannot meet the needs of industrial control and industrial automation applications that require higher resolution and higher input voltage. The Fresno (MAXREFDES11#) subsystem reference design is a 16-bit high-precision industrial analog front end (AFE) that supports 0 to 10V signals and has isolated power and data paths—all in a small form factor package. Fresno design integrates ultra-high-precision, low-noise buffer ( MAX44250 ); high-precision ADC ( MAX11100 ); ultra-high-precision 4.096V voltage reference ( MAX6126 ); 600VRMS data isolation ( MAX14850 ); isolation/regulation +5.5V, +5V and -3V supply ( MAX256 / MAX1659 / MAX1735 ). This AFE solution can be used in any application that requires high-precision analog-to-digital conversion, but the main target applications are industrial sensors, industrial automation , process control, programmable logic controllers (PLC) and medical applications .

Figure 1. Fresno subsystem design block diagram.