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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

Smaller, Lower Power 4-20mA Sensor Transmitters for Industrial Equipment

January 23, 2018

See how a new sensor transmitter provides more accuracy, less power, and reduced PCB area for industrial equipment.

Featured Products

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DS8500 HART Modem
The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities...
  • Single-Chip, Half-Duplex Modem Overlays 1200bps FSK Digital Communication on Top of Installed 4mA–20mA Current Loop Infrastructure
  • Digital Signal Processing Provides Reliable Input Signal Detection in Noisy Conditions
  • Standard Component 3.6864MHz Crystal Reduces System Cost
  • Fully Tested and Verified as a HART-Registered Modem IC
  • Integrated Solution Requires Minimal Power and Space
    • 2.7V to 3.6V Operating Voltage
    • 285µA (max) Current Consumption
    • Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN Package
    • Few External Components Required
Download Data Sheet Evaluation Kit
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MAX15501 Industrial Analog Current/Voltage Output Conditioners
The MAX15500/MAX15501 analog output conditioners provide a programmable current up to ±24mA, or ...
  • Supply Voltage Up to ±32.5V
  • Output Protected Up to ±35V
  • Programmable Output (Plus Overrange)
    • ±10V
    • 0 to 10V
    • 0 to 5V
    • ±20mA
    • 0 to 20mA
    • 4 to 20mA
  • Current Output Drives 0 to 1kΩ
  • Voltage Output Drives Loads Down to 1kΩ
  • HART Compliant
  • 2ppm Gain Error Drift Over Temperature
  • SPI Interface, with Daisy-Chain Capability
  • Supports +4.096V (MAX15500) or +2.5V (MAX15501) Full-Scale Input Signals
  • Extensive Error Reporting
    • Short-Circuit and Overcurrent Protection
    • Open-Circuit Detection
    • Brownout Detection
    • Overtemperature Protection
  • Fast, 40µs Settling Time
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MAX15500 Industrial Analog Current/Voltage Output Conditioners
The MAX15500/MAX15501 analog output conditioners provide a programmable current up to ±24mA, or ...
  • Supply Voltage Up to ±32.5V
  • Output Protected Up to ±35V
  • Programmable Output (Plus Overrange)
    • ±10V
    • 0 to 10V
    • 0 to 5V
    • ±20mA
    • 0 to 20mA
    • 4 to 20mA
  • Current Output Drives 0 to 1kΩ
  • Voltage Output Drives Loads Down to 1kΩ
  • HART Compliant
  • 2ppm Gain Error Drift Over Temperature
  • SPI Interface, with Daisy-Chain Capability
  • Supports +4.096V (MAX15500) or +2.5V (MAX15501) Full-Scale Input Signals
  • Extensive Error Reporting
    • Short-Circuit and Overcurrent Protection
    • Open-Circuit Detection
    • Brownout Detection
    • Overtemperature Protection
  • Fast, 40µs Settling Time
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MAX12900 Ultra-Low-Power 4-20mA Sensor Transmitter
The MAX12900 is an ultra-low-power, highly integrated 4-20mA sensor transmitter. The MAX12900 in...
  • Wide Input Supply Range: 4.0V to 36V
  • Ultra-Low-Power Consumption: 170μA (typ)
  • High Linearity: 0.01% (Max Error)
  • High Resolution: Up to 16 Bit
  • Low Drift Voltage Reference: 10ppm/°C max
  • Wide Temperature Range: -40°C to +125°C
  • Small Package: 5mm x 5mm x 0.8mm 32-pin TQFN
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MAX12900EVKIT Evaluation Kit for the MAX12900
The MAX12900 evaluation kit (EV kit) provides a proven design to evaluate the MAX12900, loop-pow...
  • Loop-powered 4mA–20mA Transmitter with PWM Inputs
  • Robust Operation with Wide Range Of Input Voltages
  • On-Board Microcontroller to Generate Two PWM Inputs and Provide Fault Diagnostic
  • Supports HART and Fieldbus H1 Communication
  • -40°C to +125°C Temperature Range
  • Reverse Voltage Protection
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Windows 7, Windows 8, and Windows 10 Compatible Software
DS8500-KIT Evaluation Kit for the DS8500
The DS8500 evaluation kit (EV kit) provides a convenient and a quick platform to evaluate the DS...
  • The EV Kit Provides Fast and Simple Evaluation by Providing a Total HART Communications Chain on Board
  • Example HART Master and Field Device Circuits Demonstrate Usage in the Two Most Common HART Connection Configurations
  • HART Registered Modem IC
  • On-Board Isolated 4mA–20mA Communications Loop
  • MAXQ622 USB Microcontroller with Demo Firmware
  • External Connections Allow for Advanced Evaluation of the DS8500 in Other Configurations
MAX14626EVKIT Evaluation Kit for the MAX14626
The MAX14626 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstr...
  • Evaluates Current-Limit Protection
  • Proven PCB Layout
  • Fully Assembled and Tested