TI’s e-trim technology improves offset voltage performance of new op amp

Dallas — Compared to traditional laser trimming methods, Texas Instruments Inc.'s (TI) e-trim technology greatly improves accuracy as evidenced by this high-speed operational amplifier.

From TI's Burr-Brown line, the OPA727 12-V CMOS operational amplifier utilizes e-trim, which calibrates offset voltage and temperature drift during the final steps of manufacturing.

The OPA727 is suited for applications requiring strong dynamic characteristics such as active filters, transimpedance amplifiers, audio, test equipment and process control.

“The OPA727 delivers excellent offset voltage (150μV maximum) and extremely low offset voltage drift (1.5μV/°C) through e-trim,” said Frank Haupt, strategic marketing engineer of TI's high-performance amplifier products.

E-trim technology is used to trim the OPA727's offset voltage and offset voltage drift over temperature after packaging. This significantly improves accuracy compared to traditional laser trimming methods by avoiding parameter shifts that occur during plastic molding, according to TI. E-trim brings best-in-class offset and offset drift over temperature, comparable to precision bipolar amplifiers, to low-cost CMOS operational amplifiers.

The OPA727 also provides good AC performance, TI said. Its 20-MHz bandwidth, 30 V/μs slew rate, 600 ns settling time, 6 nV/rt Hz noise and 0.0003% harmonic distortion make it practical for driving fast, 16-bit analog-to-digital converters (A/D converters) such as TI's ADS8342.

The input common-mode range extends to ground for true single-supply operation and output swings to within 150 mV of the rails, maximizing dynamic range. The OPA728 reduces the quiescent current to 6μA (typical) and features a digital ground reference pin for easy interface to standard logic levels in dual-supply applications. The OPA727 (single version) and OPA728 (single with shutdown) are fully specified and tested over the full 4 V to 12 V or ±2 V to ±6 V supply range.

The OPA727 and OPA728 are packaged in a MSOP-8 and 3mm x 3mm DFN-8. The OPA2727 (dual) is packaged in a 3mm x 3mm DFN-8 and SO-8. These versions are available today. A quad version, the OPA4727, will be available in 1Q 2005. All are specified for operation from -40°C to +125°C.

The OPA727 and OPA728 are priced from $1.45 in 1,000-piece quantities. The OPA2727 is $2.20 in like quantities.

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