General Description

The MAX40109 is a low-power, precision sensor interface SoC that includes a high-precision, programmable Analog frontend (AFE), Analog-to-Digital Converter (ADC), calibration memory, and digital signal processing. It also includes a Digital-to-Analog Converter (DAC) with an output buffer to support analog voltage output and a 4mA–20mA current loop. It is designed for sensor applications such as strain gauges, pressure, force, and temperature.

This Sensor AFE has both analog and digital outputs. The digital 1-Wire/I2C interfaces program the calibration memory, the front-end Programmable gain amplifier (PGA)'s 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.

The MAX40109 operates from 3V to 36V, is available in the Thin quad flat no-lead (TQFN) package and is specified over the -40°C to +125°C operating temperature range.

Benefits and Features

• Analog Front-End to Interface with Resistive Bridge-Based Pressure Sensors

• Temperature Measurement either directly from the Resistive Bridge or from an External Thermistor

• Analog Zero-Pressure Offset Compensation

• High-Precision PGA Front-End with 20 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

• Supply Voltage Range: 3V to 36V

• Low 2mA (typ.) Supply Current

• Available in TQFN package

Applications

• Pressure Sensors

• Strain Gauges

• Force Sensors

• Temperature Sensors

• Wheatstone-Bridge