Maxim > Design Support > Technical Documents > Subsystem Boards > APP 5721 Keywords: Fremont (MAXREFDES6 ), subsystem reference design, analog front-end (AFE) SUBSYSTEM BOARD 5721 Fremont (MAXREFDES6 ): 16-Bit, High-Accuracy, 0 to 100mV Input, Isolated Analog Front-End (AFE) Sep 19, 2013 Abstract: The Fremont (MAXREFDES6 ) subsystem reference design meets the high-resolution needs of low- voltage output sensor applications. Boards for purchase, hardware and firmware design files, and FFTs and histograms from lab measurements provide complete system information for rapid prototyping and development. Introduction Smart factories, industrial, and medical applications continue to utilize more sensors, of various configurations. While low-voltage sensors provide essential data, they also require/generate high signal-to-noise ratios, rendering many discrete and integrated analog-to-digital converters (ADCs) insufficient for these applications. More detailed image (JPG) The compact Fremont (MAXREFDES6 ) subsystem reference design (Figure 1) accurately measures low voltage, 0 to 100mV, single-ended analog signals with a high-accuracy, 16-bit analog front end (AFE) complete with an isolated data path. The design optimizes the functions of an ultra-precision low-noise buffer (MAX9632) a highly accurate ADC (MAX11100) an ultra-high-precision 4.096V voltage reference (MAX6126) a 600V RMS monolithic data isolator (MAX14850) and low-dropout (LDO) regulators providing regulated +6V, +5V, and -5V power rails (MAX1659 and MAX1735). This oneofakind AFE solution works in many applications requiring low- voltage input, high impedance, and high-accuracy analog-to-digital conversion. Page 1 of 9Figure 1. The Fremont subsystem design block diagram. Features Applications High-accuracy analog input Low-voltage output sensors High impedance Process control 0 to 100mV input range Medical Isolated data path Small printed-circuit board (PCB) area Device drivers Example C source code Pmod -compatible form factor Competitive Advantages Unique single-ended architecture Optimized board size Magnetically immune data path isolation Page 2 of 9