SANTA FE (MAXREFDES5#): 16-bit, high-precision, multiple-input, isolated analog front end (AFE)

Today 's field-programmable gate arrays (FPGAs) and microcontrollers with built-in analog-to-digital converters (ADCs) support low-resolution and low-voltage analog inputs. However, these ADCs cannot meet the needs of industrial control and industrial automation applications that require higher resolution and higher input voltage. The Santa Fe (MAXREFDES5#) subsystem is designed as a 16-bit, high-precision industrial analog front end (AFE) that supports -10V to +10V, 0 to 10V and 4–20mA current loop signals, has isolated power and data paths, and is integrated in Available in small form factor package. The Santa Fe design integrates a low-noise, high-impedance analog buffer ( MAX9632 ); a high-precision ADC with innovative on-chip attenuation ( MAX1301 ); an ultra-high-accuracy 4.096V voltage reference ( MAX6126 ); 600VRMS data isolation ( MAX14850 ); isolation/stabilization Voltage +12V, -12V and 5V supplies ( MAX256 / MAX1659 ). 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. Santa Fe subsystem design block diagram.