MAX12900
Info : RECOMMENDED FOR NEW DESIGNS
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MAX12900

Ultra-Low-Power 4-20mA Sensor Transmitter

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Less than 200µA in a Small 5mm x 5mm Package

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $3.45
Features
  • 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
Additional Details
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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.

Applications

  • Industrial Automation and Process Control
  • Loop-powered 4-20mA Current Transmitter
  • Remote Instrumentation
  • Smart Sensors
Part Models 2
1ku List Price Starting From $3.45

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX12900AATJ+
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  • HTML
MAX12900AATJ+T
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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MAX12900EVKIT

Evaluation Kit for the MAX12900

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MAX12900EVKIT

Evaluation Kit for the MAX12900

Evaluation Kit for the MAX12900

Features and Benefits

  • 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

Product Detail

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.

Applications

  • Industrial Automation and Process Control
  • Loop-powered 4-20mA Current Transmitter
  • Remote Instrumentation
  • Smart Sensors
Reference Designs

Reference Designs 1

maxrefdes1161-image1

MAXREFDES1161: Small Form Factor, High Accuracy, 2-Wire, 4–20mA Current Loop Transmitter

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MAXREFDES1161

MAXREFDES1161: Small Form Factor, High Accuracy, 2-Wire, 4–20mA Current Loop Transmitter

MAXREFDES1161: Small Form Factor, High Accuracy, 2-Wire, 4–20mA Current Loop Transmitter

Features and Benefits

  • Loop Compliance Voltage up to 36V
  • 4–20mA Output with 0.1% FSR Accuracy
  • Robust Industrial Design with Reverse Voltage Protection, and Overcurrent Protection
  • IEC 61000-4 Transient Immunity Protection
  • Industrial Standard Form Factor
  • Complete solution with Proven Layout

View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

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