4 mA Integrated Sensor Transmitter Boasts Small Footprint

Maxim Integrated Products has announced the MAX12900, an ultra-low power, highly integrated 4 mA to  20 mA sensor transmitter. Embedded system developers can use it to create small, low power and highly accurate designs for industrial automation system. Ideal applications include industrial automation and process control, loop-powered 4 mA to 20 mA current transmitters, remote instrumentation and smart sensors.

Today’s system designers must develop enhanced 4 mA to 20 mA sensor transmitters with several considerations in mind. These include improved measurement accuracy over a wide temperature range and reduced size to fit in a small enclosure. In addition, they are required to meet a tight current budget of their overall sensor transmitter system as low as 4 mA.

The MAX12900 increases system accuracy with 10 ppm / degrees C voltage reference for up to 3.5x lower drift compared to traditional solutions. The small footprint (5 mm x 5 mm package size) of the MAX12900 integrates 10 optimized building blocks that results in a significant space savings of 20%-50% vs. traditional 4 mA to 20 mA sensor transmitter implementations.

The addition of an integrated high voltage LDO and power sequencing capability simplifies the power up of the 4 mA to 20 mA sensor transmitter. Its reduced current consumption for low power requires just 250 µA of current maximum, enabling up to 50% power savings compared to traditional solutions. The new MAX12900 solution reduces implementation complexity, generating system cost savings by converting pulse width modulation data from a microcontroller into current over a 4 mA to 20 mA loop with two, three, or four wire configurations. The MAX12900 is available in a 32-pin TQFN package and operates over a wide industrial temperature range of -40℃ to +125℃.

The MAX12900 is available at Maxim’s website and select authorized distributors for $2.89 (1000+.) The MAX12900EVKIT# evaluation kit is available for $55

Maxim Integrated | www.maximintegrated.com

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