Analog Entrance Finish Reference Design

The design helps acquire analog information with a 16-bit ADC, helpful for industrial automation, medical units, and course of management, making growth simpler.

Excessive-resolution information converters are important in industrial management and automation. Whereas trendy FPGAs and microcontrollers embrace ADCs, their decision is usually inadequate, they usually could lack isolation. The Campbell (MAXREFDES4) subsystem reference design from Analog Gadgets (ADI) offers a 16-bit high-accuracy industrial analog entrance finish (AFE) that helps a 4–20mA present loop or a 0.2V to 4.096V voltage enter. It consists of remoted energy and information in a compact type. Key parts embrace a low-noise buffer, a high-accuracy ADC, a 4.096V voltage reference, 600VRMS information isolation, and remoted 5V energy rails. 

This reference design is helpful for embedded system builders integrating high-resolution ADCs with FPGAs or microcontrollers; medical gadget designers needing remoted analog entrance ends for affected person monitoring and diagnostics; energy and sign integrity engineers working with remoted energy and information transmission; and researchers exploring precision measurement options. By offering a ready-to-use remoted analog entrance finish, this design helps enhance accuracy, scale back complexity, and speed up growth.

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The reference design is appropriate for high-accuracy, remoted analog sign acquisition in numerous functions, together with industrial sensors for monitoring stress, temperature, and circulation; automation and course of management in manufacturing and robotics; and programmable logic controllers (PLCs) for manufacturing facility automation. It additionally helps medical gear akin to affected person monitoring methods, take a look at and measurement devices, and power and energy methods for good grids and industrial energy administration. 

The Pmod specification helps 3.3V and 5V modules with totally different pin assignments. This module operates solely at 3.3V and follows the SPI pin assignments proven on the proper. The Campbell subsystem is designed for a high-accuracy 4–20mA present loop or a 0.2V to 4.096V enter voltage analog-to-digital information acquisition system. It consists of remoted energy and remoted information.

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The MAX44250 op amp buffers a 4–20mA current-loop sense voltage on a 200Ω load resistor or a 0.2V to 4.096V voltage sign. The MAX11100 is a 16-bit SAR ADC with AutoShutdown and a 1.1µs wake-up time. Its reference enter is pushed by the MAX6126, a 4.096V voltage reference with 0.02% preliminary accuracy and a 3ppm/°C most temperature coefficient.

The MAX256 offers remoted energy by changing 3.3V to 12V utilizing a TGM-H281NF Halo transformer with a 1:2.6 turns ratio and an on-board voltage doubler. The MAX14850 ensures information isolation, with a mixed energy and information isolation of 600VRMS. 

This reference design helps engineers implement exact, remoted analog information acquisition in industrial environments whereas simplifying growth and integration.

ADI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) structure, and extra. The corporate’s web site has further information in regards to the reference design. To learn extra about this reference design, click on right here.