Transimpedance amp

Texas Instruments has introduced a transimpedance amplifier that features 90MHz gain bandwidth, less than 25uV offset and inherent temperature and long-term stability.

The device is ideal for scanners, medical diagnostics and current measurement in test equipment.

The 90MHz gain bandwidth of the OPA380 enables a transimpedance bandwidth of greater than1MHz in most configurations. As a result of the 25uV maximum offset voltage and 0.1uV/C offset drift, a dynamic range of five decades can be achieved, which allows the measurement of signal currents from, for example, 10nA to 1mA.

In contrast to logarithmic amplifiers, the OPA380 provides a wide bandwidth throughout the full dynamic range. Other features include 50pA bias current, 6.5mA quiescent current and a 2.7V to 5.5V supply range.

The OPA380 is packaged in an MSOP-8 and SO-8, and is available now from TI and its authorised distributors. The device is priced from $1.95 in 1,000 piece quantities (suggested resale pricing).

The OPA2380 (dual version) will be available in 2Q 2004.

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