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National Semiconductor Introduces Micropower Precision Amplifiers with Lowest Guaranteed Voltage Offset Drift over Temperature

PowerWise LMP223x Family Consumes less than 16 uW per Channel with TCVOS as low as +/- 0.4 uV per Degree Celsius

Feb 25, 2008

February 25, 2008 – National Semiconductor Corp. (NYSE:NSM) today introduced a family of micropower precision amplifiers that provides guaranteed maximum offset voltage drift over temperature (TCVOS) as low as +/- 0.4 microvolts per degree Celsius (uV/C). These 16 uW per channel operational amplifiers (op amps) feature the industry’s lowest TCVOS, along with low offset voltage, quiescent current and bias current to enable a high level of system accuracy, extended battery life and long-term stability in portable systems and battery-powered sensor interface products.

The LMP2231 single, LMP2232 dual and LMP2234 quad micropower op amps feature CMOS inputs, 1.6V to 5.5V operation, 10 uA of supply current per channel, low offset voltage of 150 uV and a wide temperature range of -40 degrees C to 125 degrees C. All three op amps have ultra-low power consumption of less than 16 uW per channel, while providing 130 kHz of usable bandwidth, which places them among National’s PowerWise® family of energy-efficient products.

Optimal instrumentation systems require that the sensor’s signal is accurately amplified without adding errors. National provides this analog signal-path solution by offering both the LMP223x devices and ADC121S021, a 12-bit, one-channel analog-to-digital converter.

The new LMP® precision op amps are built on National’s proprietary VIP50 BiCMOS process technology. The VIP50 process allows National to design higher-performance precision op amps, along with the most power-efficient, low-voltage amplifiers on the market. 

Key Features of LMP2231/32/34 Precision Op Amps
The LMP2231 single micropower, precision amplifier provides 1.6V to 5.5V guaranteed operating supply voltage range and quiescent power consumption of only 16 uW. The device features a maximum offset of 150 uV, along with a maximum offset voltage drift of 0.4 uV/C and low bias current of +/- 20 femtoamperes (fA). Its rail-to-rail output swings 15 mV from the supply voltage to increase system dynamic range. The LMP2231’s common-mode input voltage range extends 200 mV below the negative supply, making the device well-suited for use in single-supply applications with ground sensing. The LMP2231 is offered in 5-pin SOT23 and 8-pin SOIC packages.

The LMP2232 dual micropower, precision amplifier provides 1.6V to 5.5V guaranteed operating supply voltage range and quiescent power consumption of only 13 uW per channel. The device has a maximum offset voltage of 150 uV, along with a maximum offset voltage drift of 0.5 uV/C and low bias current of +/- 20 fA. The LMP2232 is offered in 8-pin SOIC or 8-pin MSOP packages.

The LMP2234 quad micropower, precision amplifier provides 1.6V to 5.5V operating voltage range and quiescent power consumption of only 12 uW per channel. The device has a maximum offset voltage of 150 uV, along with a maximum offset voltage drift of 0.75 uV/C and low bias current of +/- 20 fA. The LMP2234 is offered in 14-pin SOIC or 14-pin TSSOP packages.

About National’s Amplifier Portfolio
Specializing in high-performance amplifiers and comparators, National Semiconductor offers a complete portfolio of op amps addressing the high-speed, precision, low-voltage and low-power markets with products ranging from building-block ICs to application-specific standard products (ASSPs). The company has a long history of setting industry standards in amplifiers and continues this trend with product releases on National’s advanced VIP10 bipolar and VIP50 BiCMOS processes. National also leads the industry in packaging technology with its revolutionary Silicon Dust™ and micro SMD packaging technologies. For more information on National’s amplifier products, visit amplifiers.national.com.

Pricing and Availability
All three products are available now with prices ranging from $1.10 to $2.35 in 1,000-unit quantities. For more information and easy-to-order samples, visit http://www.national.com/pf/LM/LMP2231.html, http://www.national.com/pf/LM/LMP2232.html, and http://www.national.com/pf/LM/LMP2234.html. National’s Amplifiers Made SimpleSM WEBENCH® online design tool supports a large selection of amplifiers. To explore these solutions, visit http://webench.national.com. To learn more about designing with amplifiers, visit our library at http://www.national.com/onlineseminar/#amps.

Note to Editors: To view a high-resolution downloadable photo of these products, visit National's photo gallery.  

About National’s PowerWise Brand
National’s PowerWise brand reflects the company’s energy-efficient product portfolio.  It signifies products with outstanding performance-to-power at the component level, as well as products that provide an outstanding, energy-efficient solution when coupled with other National parts. National’s PowerWise family of products features energy-efficient power management, operational amplifiers, interface, and data conversion products.  For more information about National’s PowerWise brand, visit: http://www.national.com/powerwise.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays, communications infrastructure, medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional company and product information is available at www.national.com.