MAX12900ATJ+W

Sensor And Detector Interfaces Overview

The MAX12900ATJ+W is an ultra-low-power, highly integrated 4-20mA sensor transmitter from Analog Devices Inc./Maxim Integrated. It combines ten building blocks in a 5mm x 5mm 32-pin TQFN package: a wide input supply voltage LDO (4.0V to 36V), two PWM conditioner circuits, two general-purpose op amps, one zero-offset drift op amp, two diagnostic comparators, a power-up sequencer with PWRGOOD output, and a low-drift 2.5V voltage reference. The device converts microcontroller PWM data into current over a 4-20mA loop with two, three, or four-wire configurations. Typical supply current is 170µA at VCC = 24V. It supports HART and Foundation Fieldbus H1 modulation and operates from -40°C to +125°C.

Sensor And Detector Interfaces Feature Summary

• Integrates dual PWM conditioners for stable amplitude conversion from microcontroller signals.
• Includes high-accuracy analog front-end with low-drift voltage reference and precision operational amplifiers.
• Features built-in diagnostic capabilities including supply rail monitoring and open circuit detection.
• Provides a power-up sequencer with a power good output for smooth system initialization.

Sensor And Detector Interfaces Applications

• Loop-powered 4-20mA current transmitters
• Smart sensors
• Remote instrumentation
• Industrial automation and process control

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm RoHS compliance and package details. Confirm availability through authorized distributors as stock levels fluctuate. Ensure the component matches the required industrial temperature range and pinout specifications for your design.

Sensor And Detector Interfaces Selection Notes

Select this component when designing loop-powered transmitters requiring high linearity and low power consumption. The integrated PWM receivers simplify digital-to-analog conversion compared to discrete solutions. Consider the available op amps and comparators for additional signal conditioning needs within the same package footprint.

Sensor And Detector Interfaces Part Context

This part belongs to the MAX12900 family of ultra-low-power sensor transmitters. It is designed to replace multiple discrete components typically found in 4-20mA transmitter designs, reducing board space and complexity. The device is manufactured by Analog Devices Inc./Maxim Integrated.

Sensor And Detector Interfaces Replacement Considerations

Check for direct pin-compatible alternatives within the Maxim Integrated portfolio if lead times are critical. Verify that any substitute maintains the same 32-pin TQFN package dimensions and thermal characteristics.

Sensor And Detector Interfaces FAQ

How does the MAX12900 convert digital signals to analog current?

It uses two PWM conditioner circuits to receive PWM data from a microcontroller, which are then converted into a stable current output via an active filter and a wide-bandwidth operational amplifier.

What communication protocols are supported by the analog backend?

The device allows HART and Foundation Fieldbus H1 signal modulation through its wide bandwidth operational amplifier combined with a discrete transistor.

What is the typical supply current consumption?

The typical supply current is 170µA when operating at VCC = 24V and VCCI = 3.3V with no load.