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Texas Instruments Incorporated introduces two configurable analog front ends (AFE)

These provide an easy-to-use, modular solution for bridging the gap between the microprocessor and sensor. Design engineers can dramatically reduce their development time by using a single AFE across multiple nondispersive infrared (NDIR) gas sensor and pH sensor platforms instead of designing several complex discrete solutions.

The AFEs team with TI's WEBENCH® Sensor AFE Designer software and bench-top development system.

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.

Key features and benefits
Complete gas sensing solution: AFE integrates a programmable gain amplifier (PGA), "dark phase" offset cancellation circuitry, adjustable common-mode generator, and SPI interface to simplify system design.

Programmable gain amplifier: Features low gain range and high gain range, allowing the use of thermopiles with different sensitivities.
Well-specified performance: 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.

Small form factor: Integration shrinks package to 3 mm x 4.9 mm.

The highly-integrated 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.

Key features and benefits
Complete pH sensing solution: 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.

Higher reliability and system accuracy: 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.

Wide operating range: Operation 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.

Small form factor: Integration shrinks package to 5 mm x 6.4 mm.

For more information and to order samples, click here


Texas Instruments

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