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Low-offset op amp family suits portable apps

Posted: 25 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:operational amplifier? portable application? battery life?

LMP precision op amps

National Semiconductor Corp. has unveiled five new precision operational amplifiers designed for portable test and measurement, industrial and medical systems that require signal-conditioning and sensor interface accuracy at gains of 6V/V or higher.

The LMP7707, LMP7708 dual, LMP7709 quad, LMP7717 single and LMP7718 dual op amps are the latest additions to the company's PowerWise energy-efficient product family.

The LMP7717 single op amp delivers 88MHz gain bandwidth while consuming only 1.15mA of quiescent current, while the LMP7707 provides 14MHz gain bandwidth at 0.715mA of quiescent current. These high bandwidth-to-power ratios enable power efficiency for extending battery life in portable devices. In addition, the precision of the LMP7717 and LMP7718 supports data acquisition systems of 16bit or greater. In these high-resolution data acquisition systems, the designer commonly scales the output of a sensor to the full-scale input of an ADC to ensure optimum sensitivity.

The LMP7717 single and LMP7718 dual op amps are low-noise, CMOS input operational amplifiers that offer a low-input voltage noise density of 5.8nV/sqrt Hz. The devices are stable at a gain of 10 and higher. The LMP7717 and LMP7718 also have a supply voltage range of 1.8V to 5.5V and can operate from a single supply or dual supplies.

By providing an input bias current of only 100fA, these precision amplifiers provide optimal performance in low-voltage and low-noise systems. Their precision DC specifications include an input offset voltage of less than 180?V to improve overall system accuracy. The LMP7717 is offered in 5-pin SOT23 or 8-pin SOIC packages, while the LMP7718 is offered in 8-pin SOIC or 8-pin MSOP packages.

Meanwhile, the LMP7707 single, LMP7708 dual and LMP7709 quad are low offset voltage, rail-to-rail input and output precision amplifiers. They provide an operating voltage range up to 12V for single or dual supply applications and are stable at a gain of 6V/V and higher. The high-speed devices feature CMOS input and offer the key specifications required for superior performance and signal conditioning accuracy, including low-input noise density of 9nV/sqrt Hz, guaranteed low offset voltage of less than 200?V and a guaranteed low input bias current of less than 1pA.

Additionally, the LMP7707/08/09 devices exceed 100dB for CMRR, power supply rejection ratio as well as large signal voltage gain. The LMP7707, LMP7708 and LMP7709 are offered in 5-pin SOT23, 8-pin MSOP and 14-pin TSSOP packages, respectively.

The new LMP precision op amps are built on National's VIP50 BiCMOS process technology. VIP50 allows the company to design higher-performance precision op amps, along with the most power-efficient, low-voltage amplifiers on the market. The five new products are available with prices ranging from $1.05 to $2.45 in 1,000-unit quantities.

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