Zero-Drift, Zero-Crossover Operational Amplifier

Continuing to set the standard for precision amplifiers, Texas Instruments (TI) today introduced 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.

The unique architecture of the OPA388 produces an industry-leading combination of ultra-high input linearity and precision. TI's zero-drift technology 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.

Key features and benefits of the OPA388 op amp: Delivers true precision with ultra-high input linearity: The device's zero-crossover topology eliminates the input offset transition region of traditional complementary metal-oxide semiconductor (CMOS) op amps, assuring maximum linearity and minimal distortion across the entire common-mode input range.

Provides high dc precision: TI's zero-drift technology delivers a low maximum offset voltage of 5µV, a typical offset voltage drift of 0.005μV / degree C and a maximum input bias current of 700pA over the extended industrial temperature range of -40 to 125 degrees C. This eliminates the need for costly over-temperature calibration and increases dc precision.

Supports wide-bandwidth operation: With a 10-MHz gain bandwidth product (GBW), the OPA388 enables high gain configurations and makes it possible to acquire a wide range of signal types and frequencies to support equipment from precision weigh scales to heart-rate monitors.

Maintains low distortion for high performance: The ultra-low total harmonic distortion of -132 dBc and voltage noise of 7 nV/√Hz help produce a high-resolution signal chain for specialized applications such as programmable logic controllers, precision field transmitters and motion-control equipment.

Reduces complexity and cost: Merging zero-drift and zero-crossover technology reduces signal-chain complexity and external component count, allowing designers to minimize board space and bill of materials (BOM) cost.

The OPA388 is available now through the TI store and authorized distributors. It is priced at US$0.98 in 1,000-unit quantities and comes in a 4.9-mm-by-3.9-mm small-outline integrated circuit (SOIC) package.