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Low-voltage precision op amps enable sensor measurement

Texas Instruments has expanded its 1.8V precision op amp (operational amplifier) portfolio with op amps for low-noise, high-impedance sensor measurement. The first product in the OPAx320 family, the two-channel OPA2320, provides 20MHz of gain bandwidth and 0.2pA input bias current to enable high accuracy and dynamic range for high-impedance optical and chemical sensor front ends, programmable logic controllers, motor control loops, and test and measurement equipment. The power-efficient, wideband, low-noise precision op ampsoffer a maximum input bias current of 0.9pA to support high-impedance sensor signal conditioning.
The op amps deliver precision with zero crossover distortion, delivering a maximum offset voltage of 150uV, high common mode rejection rate of 114dB and rail-to-rail input/output to drive low-power, successive approximation ADCs (analogue-to-digital converters), such as ADS8319, ADS8327 and ADS7279, up to 1Msamples/s. The op amps combine low noise of 7nV/√Hz at 10kHz and wide gain-bandwidth of 20MHz at a low quiescent current of 1.45mA per channel for use as an active filter in automated test equipment.

The company offers a variety of free tools and support to speed development with the op amps, including: a SPICE model for designing, testing, and troubleshooting a variety of basic and advanced circuits, including complex architectures, without any node or number of device limitations; software for analysis, application and calculation utilities, including analogue filter designer, filterpro, and calculators for decibel, frequency/wavelength and op amp gain stage. The OPA2320 is available in a 3x4.9mm MSOP-8 package.