TI introduces first configurable NDIR gas sensing and pH sensing AFEs

The AFEs team with TI’s WEBENCH Sensor AFE Designer software and bench-top development system. These tools allow engineers to select a sensor, design and configure the solution and download configuration data to the sensor AFE for immediate prototyping.

The highly-integrated LMP91050 NDIR gas sensing AFE supports multiple thermopile sensors for NDIR sensing, indoor CO2 monitoring, demand control ventilation, HVAC, alcohol breath analysis, greenhouse gas monitoring and Freon detection.

The AFE integrates a programmable gain amplifier (PGA), “dark phase” offset cancellation circuitry, adjustable common-mode generator, and SPI interface to simplify system design and a programmable gain amplifier features low gain range and high gain range, allowing the use of thermopiles with different sensitivities.

The device has a low gain drift of 100 ppm/degrees C (maximum), output offset drift of 1.2 mV/degrees C, phase delay variation of 500 ns, low noise at 0.1 uV rms (0.1 to 10 Hz), and operation between -40 degrees C to 105 degrees C provide optimized system performance.

The LMP91200 pH Sensing AFE supports two electrode pH sensors used in analyzer platforms for emissions monitoring, steam and water quality monitoring, chemical/petrochemical plants, food processing and more.

The AFE integrates a PGA, ultra-low input-bias pH buffer, signal guarding, temperature and measurement calibration, and common-mode generation and diagnostics circuitry, allowing use of a single chip to interface to most of today’s pH sensors. An on-board sensor test ensures proper connection and functionality, and ultra-low bias current of 0.4 pA (maximum) boosts system reliability and accuracy while also protecting the pH electrodes during no supply situations.

The device operates from 1.8 V to 5.5 V and -40 degrees C to 125 degrees C, with a guaranteed low pH buffer input bias current across the operating range, provides maximum flexibility.

TI offers the entire signal chain for sensing applications, enabling engineers to combine components from the following families: Sensor AFE, MSP430 ultra low power 16-bit microcontroller, and 4 to 20mA transmitters such as the DAC161P997 and XTR117.

Texas Instruments

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