This reference design describes a cost-effective, low-power liquid-level measurement data acquisition system (DAS) that use a compensated silicon pressure sensor and a high-precision delta-sigma ADC. The document explains how to implement a design that measures and distributes most industrial liquids using a noncontact measurement approach. It also suggests system algorithms, provides noise analysis, and describes calibration ideas to improve system performance while reducing complexity and cost.
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.
The Monterey (MAXREFDES15#) subsystem reference design is a high-accuracy industrial loop powered sensor transmitter that connects to any standard PT1000 resistance sensor and converts the linearized temperature to a 4–20mA current signal, which is immune to noise and remains constant over long distances.
This document explains how the Fresno (MAXREFDES11#) subsystem reference design meets the higher resolution and higher voltage needs of industrial control and industrial automation applications. Hardware and firmware design files as well as FFTs and histograms from lab measurements are provided.
Many industrial and medical applications require temperature measurements with accuracies of ±1°C or better, performed with reasonable cost over a wide range of temperatures (-270°C to +1750°C) and often with low power consumption. This article describes design of the cost-efficient, portable, high-resolution data-acquisition systems (DAS) based on precision delta-sigma analog-to-digital converters (ADCs). It also presents formulas and software for implementation of standardized linearization calculation algorithms to accurately cover this wide temperature range while ensuring reproducible measurements.
This reference design shows how to develop a high-performance, high-voltage 2- or 3-wire 4–20mA current-loop transmitter suitable for industrial process control and smart sensors. Error analysis and overtemperature characterization data as well as hardware design and software are provided.
This document explains how the Campbell (MAXREFDES4#) subsystem reference design meets the higher resolution and isolation needs of industrial control and industrial automation applications. Hardware and firmware design files as well as FFTs and histograms from lab measurements are provided.
The Novato reference design (MAXREFDES16#) is a 16-bit, high-accuracy, loop-powered temperature transducer that transmits temperature information from a remote object to the central control unit over a 4–20mA current loop and using the highway addressable remote transducer (HART) communication protocol.
The Petaluma (MAXREFDES30#) subsystem reference design is a cost optimized, high-speed and high-accuracy analog measurement solution for three-phase power monitoring applications. Hardware, firmware, design files, and lab measurements provide complete system information for rapid prototyping and development.
The Alameda (MAXREFDES24#) subsystem reference design features four dense, highly accurate analog outputs in a compact, galvanically isolated form factor. Each channel provides current or voltage. This design uniquely fits in programmable logic controllers (PLC), distributed control systems (DCS), and other industrial applications. Hardware, firmware design files, and lab measurements are provided for rapid prototyping and development. The board is also available for purchase.
Maxim’s MAXREFDES36# reference design is an IO-Link, low-power, 16-channel digital input hub compliant with IEC 61131-9. It contains two octal digital input serializers, an IO-Link transceiver and efficient step-down converter. The entire design fits in a standard DIN rail printed circuit board (PCB) holder.
The MAXREFDES72# reference design is a software configurable interface adapter that allows Pmod boards to be connected to Arduino headers. This board addresses the level shifting and pin multiplexing challenges associated with adapting these different interfaces.
The MAXREFDES74# is a precision data acquisition system which includes an 18-bit, 500ksps, ±5V SAR analog-to-digital converter (ADC), the MAX11156, and an 18-bit, 3μs settling time, ±2 LSB (max) INL digital-to-analog converter (DAC), the MAX5318. The data acquisition system can be used as a stand-alone evaluation board or as a mezzanine card to ZedBoard?, a development board for the Xilinx? Zynq?-7000 All Programmable SoC.
The MAXREFDES61# reference design ushers in the era of Industry 4.0. With a complete analog front-end for the next generation of ultra-small programmable logic controllers, this design meets the higher resolution and higher voltage needs of industrial control and industrial automation applications, while consuming minimal power and space. This high-performance system features four channels of analog input, a complete, efficient power-supply system and on-board processing. Hardware and firmware design files as well as FFTs and histograms from lab measurements are provided.
The MAXREFDES61# reference design ushers in the era of Industry 4.0. With a complete analog front-end for the next generation of ultra-small programmable logic controllers, this design meets the higher resolution and higher voltage needs of industrial control and industrial automation applications, while consuming minimal power and space. This high-performance system features four channels of analog input, a complete, efficient power-supply system and on-board processing. Hardware and firmware design files as well as FFTs and histograms from lab measurements are provided.
The MAXREFDES70# reference design is a high-precision, low-cost, low-power consumption, battery-powered heat/flow meter featuring the MAX35101 ultrasonic time-to-digital (TDC) converter with analog front-end (AFE). The reference design provides a high-performance flow/heat meter design platform that works as a foundation for many specific meter applications. The system utilizes the ultrasonic time-of-flight (TOF) measurement principle. A 3.6V, 4.0Ah, size A lithium-thionyl chloride battery powers the system and can last up to 20 years for typical use. Test results, hardware files, and firmware source code provide complete documentation for the design. The complete meter is also available for purchase.
The MAXREFDES38# subsystem reference design is a 3-channel, high-accuracy, low-power analog front-end solution for EPT/ECT and smart-grid current fault-sensing applications. Hardware, firmware, design files, and lab measurements provide complete system information for rapid prototyping and development.
The MAXREFDES75# is a high-resolution weigh scale reference design with a 0 to 10V output. The design, or strain-gauge measuring system, includes the MAX11270, a 24-bit, 64ksps, delta-sigma analog-to-digital converter (ADC), and the MAX542, a 16-bit, 1μs settling time, 2 LSB (max) INL digital-to-analog converter (DAC). The MAXREFDES75# operates as a stand-alone reference board and includes calibration using a USB and a Windows® PC.
Maxim Integrated’s MAXREFDES42# reference design is a low-power, IO-Link RTD temperature sensor compliant with IEC 61131-9. The system contains an RTD-to-digital converter, an IO-Link transceiver, an efficient step-down converter, and a display. The MAXREFDES42# comes preprogrammed and ready to connect with a version 1.1-compliant IO-Link master. Design files including the schematic, PCB, BOM, and firmware source code are available for download.
The MAXREFDES73# reference design is a wearable, mobile galvanic skin response system. Featuring the MAX32600 wellness measurement microcontroller, this battery-powered platform takes high-precision AC impedance measurements while consuming minimal power.
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