Op-amp For Precision, Low-Error Measurements In T&M


TI has claimed the first operational amplifier (op amp) to offer both zero-drift and zero-crossover technology. The OPA388 op amp maintains high precision across the entire input range for a variety of industrial applications, including test and measurement, medical and safety equipment, and high-resolution data-acquisition systems.

Key features and benefits of the OPA388 op amp include high precision, wide-bandwidth operation, low distortion for high performance and reduced complexity and cost.

Applications include bridge amplifiers, strain gauges, test equipment, current shunt measurement, thermocouples, thermopiles, electronic scales, medical instrumentation, and many more.

According to the Press release, the OPA388 utilises TI’s zero-drift technology which eliminates temperature drift and flicker noise to attain the highest DC precision and dynamic error correction, while its zero-crossover topology eliminates offset errors caused by common-mode limitations to achieve linear output and true rail-to-rail input operation.


The op-amp delivers a low maximum offset voltage of 5 µV, a typical offset voltage drift of 0.005 μV/°C and a maximum input bias current of 700 pA over the extended industrial temperature range of -40°C to 125°C. This eliminates the need for costly overtemperature calibration and increases DC precision.

With a 10-MHz gain bandwidth product (GBW), the device can acquire a wide range of signal types and frequencies to support equipment from precision weigh scales to heart-rate monitors.

In addition, the op-amp features an ultra-low total harmonic distortion of -132 dBc and voltage noise of 7 nV/√Hz to offer high-performance in specialized applications such as programmable logic controllers, precision field transmitters and motion-control equipment.

Designers can minimize board space and bill of materials (BOM) cost as the op-amp reduces signal-chain complexity and external component count.

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Support tools for the OPA388 include a reference design that demonstrates how to use the precision op amp to eliminate crossover nonlinearity in digital-to-analog converters.

The OPA388, priced at US$0.98 in 1,000-unit quantities, is available now in a 4.9 x 3.9mm small-outline integrated circuit (SOIC) package.

For more information, visit www.ti.com/opa388-pr.

To view the full Press release, click here.



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