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Current loops are useful for accurately communicating analog signals over long distances. Unlike voltage, current does not vary due to line resistance or capacitance—both which change with cable length. Current loops provide a high level of noise immunity. As a result, they are widely used in electrically noisy environments.

Maxim provides a wide range of products designed for implementing and protecting 4-20mA communication links.

Current Loop Protector

Faulty current loop conditions as well as reverse inputs can easily damage sensor devices. Maxim...

Sensor Output Conditioners

Analog signals from sensors need to be conditioned or prepared for further processing, e.g., for...

HART Modem IC

Highway Addressable Remote Transducer (HART®) technology allows a secondary (digital) signal to ...


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Blogs

Understand When and Why System Reliability Matters

October 13, 2021

Get a better understanding of when and why system reliability is important and how a low-power microcontroller can enhance reliability.

Keep the Lights On When Someone is Home

August 14, 2021

This blog discusses power outages and Maxim’s new solution for power backup in battery and line powered systems

Smart Wake-up for Security and Home Monitoring Cameras

May 19, 2021

A combination of the ultra- low power Artificial Intelligence (AI) processor and pattern recognition models greatly enhances smart wake up by detecting one or more people in the field of view with minimum power.

Assistant Excellence Conference - It Takes Two

March 11, 2021

The annual Assistant Excellence Conference (AEC) provides professional development for Maxim global assistants and is produced by the Maxim assistant community.

Two Tools to Ease Inductor Selection

March 05, 2021

Learn about two tools to help with power design and inductor selection: Maxim's EE-Sim Design Tool and Würth's REDEXPERT.

Slash Power Dissipation with Maxim’s Industrial Protected Low-Side Digital Output Solution

February 23, 2021

Greatly reduce power dissipation and shrink form factor with a highly robust integrated digital output solution, the MAX14919.

On the Go Vital Monitoring and Gaming Platform

January 13, 2021

This blog explores an application using a low power SIMO PMIC, the world’s smallest solution size and highest system efficiency, and the story behind it.

The Dawn of the Self-Aware Machine

December 10, 2020

What does "The Dawn of the Self-aware Machine" really mean? I am sure many are thinking of the human-like robots seen in the movies as a way to further replace people on the factory floor.

How iButton Devices Facilitate Electric Car Safety

October 29, 2020

Formula Student Germany competitors design fierce electric race cars. They’ve relied on Maxim Integrated’s iButton devices for electric car safety.

How Being Bold Brings Smart Automation Solutions

October 27, 2020

See how the industry’s first true software-configurable universal analog IO solution provides the flexibility to meet industrial automation challenges.

Featured Products

DS8500 HART Modem

DS8500 HART Modem

The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities. It has been fully tested and verified and has received a HART® Certificate of Registration. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signal, has very low power consumption, and needs only a few external components due to the integrated digital signal processing. The input signal is sampled by an analog-to-digital converter (ADC), followed by a digital filter/demodulator. This architecture ensures reliable signal detection in noisy environments. The output digital-to-analog converter (DAC) generates a sine wave and provides a clean signal with phase- continuous switching between 1200Hz and 2200Hz. Low power is achieved by disabling the receive circuits during transmit and vice versa. The DS8500 is ideal for low-power process control transmitters.
MAX15501 Industrial Analog Current/Voltage Output Conditioners

MAX15501 Industrial Analog Current/Voltage Output Conditioners

The MAX15500/MAX15501 analog output conditioners provide a programmable current up to ±24mA, or a voltage up to ±12V proportional to a control voltage signal. The control voltage is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501. The output current and voltage are selectable as either unipolar or bipolar. In the unipolar configuration, a control voltage of 5% full-scale (FS) produces a nominal output of 0A or 0V to achieve underrange capability. A control voltage of 100%FS produces one of two programmable levels (105%FS or 120%FS) to achieve overrange capability. The outputs of the MAX15500/MAX15501 are protected against overcurrent conditions and a short to ground or supply voltages up to ±35V. The devices also monitor for overtemperature and supply brownout conditions. The supply brownout threshold is programmable.

The MAX15500/MAX15501 are programmed through an SPI™ interface capable of daisy-chained operation. The MAX15500/MAX15501 provide extensive error reporting through the SPI interface and an additional open-drain interrupt output. The devices include an analog output to monitor load conditions.

The MAX15500/MAX15501 operate over the -40°C to +105°C temperature range. The devices are available in a 32-pin, 5mm x 5mm TQFN package.
MAX15500 Industrial Analog Current/Voltage Output Conditioners

MAX15500 Industrial Analog Current/Voltage Output Conditioners

The MAX15500/MAX15501 analog output conditioners provide a programmable current up to ±24mA, or a voltage up to ±12V proportional to a control voltage signal. The control voltage is typically supplied by an external DAC with an output voltage range of 0 to 4.096V for the MAX15500 and 0 to 2.5V for the MAX15501. The output current and voltage are selectable as either unipolar or bipolar. In the unipolar configuration, a control voltage of 5% full-scale (FS) produces a nominal output of 0A or 0V to achieve underrange capability. A control voltage of 100%FS produces one of two programmable levels (105%FS or 120%FS) to achieve overrange capability. The outputs of the MAX15500/MAX15501 are protected against overcurrent conditions and a short to ground or supply voltages up to ±35V. The devices also monitor for overtemperature and supply brownout conditions. The supply brownout threshold is programmable.

The MAX15500/MAX15501 are programmed through an SPI™ interface capable of daisy-chained operation. The MAX15500/MAX15501 provide extensive error reporting through the SPI interface and an additional open-drain interrupt output. The devices include an analog output to monitor load conditions.

The MAX15500/MAX15501 operate over the -40°C to +105°C temperature range. The devices are available in a 32-pin, 5mm x 5mm TQFN package.
MAX12900 Ultra-Low-Power 4-20mA Sensor Transmitter

MAX12900 Ultra-Low-Power 4-20mA Sensor Transmitter

The MAX12900 is an ultra-low-power, highly integrated 4-20mA sensor transmitter. The MAX12900 integrates ten building blocks in a small package: a wide input supply voltage LDO, two conditioner circuits for pulse-width modulated (PWM) inputs, two low-power, low-drift, general purpose operational amplifiers (op amp) one wide bandwidth, zero-offset drift operational amplifier; two diagnostic comparators, a power-up sequencer with power good output to allow for a smooth power-up, and a low-drift voltage reference.

The MAX12900 converts PWM data from a microcontroller into current over a 4-20mA loop with two, three, or four wire configurations.

The equivalent to an ultra-low-power, high-resolution, digital-to-analog converter is realized with the combination of two-PWM signals received from a microcontroller, the two conditioner circuits, and an active filter built with the integrated low-power op amp. The outputs of the two conditioner circuits provide a stable PWM amplitude over voltage supply and temperature variation. The wide bandwidth amplifier, in combination with a discrete transistor, converts a voltage input into a current output and allows HART and Foundation Fieldbus H1 signal modulation. The zero-offset operational amplifier and the low-drift voltage reference provide negligible error over wide temperature. The low-power operational amplifier and comparators provide building blocks for enhanced diagnostic features. Supply rail monitoring, output current readback, open circuit and failure detection are a few examples of diagnostic features. All these features, as well as ultra-low-power and high accuracy make the MAX12900 ideal for loop-powered smart sensor transmitters for industrial application.

The MAX12900 is available in 5mm x 5mm 32-pin TQFN package and operates over a wide industrial temperature range of -40°C to +125°C.
MAX12900EVKIT Evaluation Kit for the <a href="/en/products/MAX12900">MAX12900</a>

MAX12900EVKIT Evaluation Kit for the MAX12900

The MAX12900 evaluation kit (EV kit) provides a proven design to evaluate the MAX12900, loop-powered 4–20mA sensor transmitter. The EV kit includes an evaluation board and a graphical user interface (GUI) that provides communication from a PC to the target device through a USB port.

The EV kit includes Windows® 7, Windows 8, and Windows 10 compatible software for exercising the features of the IC. The EV kit GUI allows to set the Coarse and Fine PWM duty cycle inputs to the MAX12900 to control the 4-20mA loop current with ±1µA resolution.

The EV kit must be powered from an external +24V power supply and consumes less than 2.7mA.

The MAX12900 EV kit comes with a MAX12900ATJ+ installed in a 32-pin, 5 x 5mm TQFN-EP package.

DS8500-KIT Evaluation Kit for the DS8500

The DS8500 evaluation kit (EV kit) provides a convenient and a quick platform to evaluate the DS8500 HART® modem. It allows quick evaluation through a demonstration mode and in-depth evaluation using HART Communication Foundation (a part of FieldComm Group) tools.

MAX14626EVKIT Evaluation Kit for the MAX14626

The MAX14626 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the MAX14626 high-voltage 4–20mA current-loop protector.