NDIR gas sensing and pH sensing AFEs are industry’s first

NDIR gas sensing and pH sensing AFEs are industry’s first

The LMP91050 and LMP91200 configurable sensor AFEs are used in Nondispersive Infrared (NDIR) gas sensing and low-power chemical sencing applications, respectively.The LMP91050 features a PGA, ‘dark phase’ offset cancellation, an SPI, and an adjustable common mode generator.

Offered in a 10-pin MSOP package, the LMP91050 offers a low gain drift of 100 ppm/°C (maximum), output offset drift of 1.2 mV/°C, phase delay variation of 500 ns, low noise at 0.1 µV rms (0.1 to 10 Hz), and operation between –40°C to 105°C provide optimized system performance.

Features for the LMP91200 includes 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. Housed in a 16-pin TSSOP, this part also has a bias current of 0.4 pA (maximum), an operating voltage range from 1.8 to 5.5 V, and a temperature range from –40° to 125°C.

Both AFEs are supported with TI’s WEBENCH Sensor AFE Designer software and bench-top development system. (ea/1,000; LMP91200, $1.32; LMP91200,$3.90 available now)

By Christina Nickolas

Texas Instruments , Dallas , TX
Information 800-477-8924
www.ti.com