Analog Devices Inc. MAX40109 Low-Power Precision Sensor Interface SoCs

Analog Devices Inc. MAX40109 Low-Power Precision Sensor Interface SoCs include a high-precision, programmable Analog Front-End (AFE), Analog-to-Digital Converter (ADC), calibration memory, and digital signal processing. The devices provide a Digital-to-Analog Converter (DAC) with an output buffer to support analog voltage output and a 4mA to 20mA current loop. Available in a Thin Quad Flat No-Lead (TQFN) package, MAX40109 operates from 3V to 36V and is specified over a -40°C to +125°C operating temperature range. These SoCs are designed for sensor applications such as strain gauges, pressure, force, and temperature.

These sensor AFEs have both analog and digital outputs. The digital 1-Wire/I²C interfaces program the calibration memory, the front-end Programmable Gain Amplifier’s (PGA) gain, and the internal current source that drives the sensors’ bridge. The digital I²C interface can also be
used to retrieve the digital output data and generate alarms.

Features

Analog front-end to interface with resistive bridge-based pressure sensors
Temperature measurement either directly from the resistive bridge or an external thermistor
Analog zero-pressure offset compensation
High-precision PGA front-end with 20x gain options
Analog and digital outputs
Digital 1-wire, Power Line Communication (PLC) and I²C interfaces

Calibration memory with third-order polynomial for compensation from temperature and non-linearity
Internal Electromagnetic Interference (EMI) rejection
3V to 36V supply voltage range
Low 2mA typical supply current
TQFN package

Applications

Pressure sensors
Strain gauges
Force sensors

Temperature sensors
Wheatstone-bridge

Analog Devices Inc. MAX40109 Low-Power Precision Sensor Interface SoCs

Features

Applications

Simplified Block Diagram

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