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Low-voltage precision op amps aid sensor measurement

Posted: 03 Feb 2011     Print Version  Bookmark and Share

Keywords:operational amplifiers  sensor measurement 

Texas Instruments Inc. introduces the OPAx320 family of power-efficient, wideband, low-noise precision operational amplifiers (op amps) that aid low-noise, high-impedance sensor measurement.

The first product in the family, the two-channel OPA2320, provides 20MHz of gain bandwidth and 0.2pA input bias current (Ib) for high-impedance optical and chemical sensor front ends, PL controllers, motor control loops, and test and measurement equipment.

The devices offer maximum input bias current of 0.9pA to support high-impedance sensor signal conditioning. They deliver zero crossover distortion, delivering a maximum offset voltage of 150µV, common mode rejection rate of 114dB and rail-to-rail input/output to drive low-power, successive approximation (SAR) ADCs up to 1MSPS. The op amps combine low noise of 7nV/rtHz at 10kHz and wide gain-bandwidth of 20MHz at a quiescent current of 1.45mA per channel for use as an active filter in ATE.

TI offers free tools and support to speed development with the OPAx320 family, including a SPICE model for designing, testing, and troubleshooting a broad 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 are also available.

The OPA2320 is available now in a 3 x 4.9mm MSOP-8 package. Suggested retail pricing starts at Rs.57.33 ($1.25) for 1,000-unit quantities. 4.9 x 6mm SOIC-8 and 3 x 3mm SON-8 package options will be available in March.

The single-channel OPA320 will be available in April in a 3.9 x 2.8mm SOT23-5 package. Suggested retail pricing starts at Rs.36.69 ($0.80) for 1,000-unit quantities.

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