Maxim Integrated has launched a low power, highly integrated 4-20mA sensor transmitter that cust the power consumption in industrial automation and process control design by half.
Nowadays, system designers must develop enhanced 4-20mA 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 of 4mA maximum.
The MAX12900 increases system accuracy with 10 ppm/°C voltage reference for up to 3.5x lower drift compared to traditional solutions. The small footprint (5mm x 5mm package size) of the MAX12900 integrates 10 building blocks that results in significant space savings of 20%-50% over traditional 4-20mA sensor transmitter implementations. Thi sia achieved by converting pulse width modulation data from a microcontroller into current over a 4-20mA loop with two, three, or four wire configurations.
The addition of an integrated high voltage LDO and power sequencing capability simplifies the power up of the 4-20mA sensor transmitter. The lower current consumption needs 250uA of current maximum, enabling up to 50% power savings compared to traditional solutions.
"With Maxim's MAX12900, we now have the flexibility to implement 2- and 3-wire configuration in our solutions," said Juergen Schmollinger, Group Leader, Development Electronics, Pressure Sensors at IFM. "In addition, we can use it with both a mid and high end 4-20mA transmitter due to its high accuracy."
"The combination of integration and flexibility, coupled with low power and high accuracy, makes the MAX12900 an ideal solution for low power sensor transmitters and industrial safety applications," said Carmelo Morello, Executive Business Manager at Maxim Integrated.
The MAX12900 is available in a 32-pin TQFN package and operates over a wide industrial temperature range of -40°C to +125°C for $2.89. The MAX12900EVKIT# evaluation kit is available for $55.