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National Semiconductor Introduces Six Precision and Low-Voltage Amplifiers Based on New Advanced BiCMOS Process

New Devices Designed on Analog VIP50 Process Dramatically Improve Precision and Power Efficiency for Portable and Industrial Applications

Sep 26, 2005

September 26, 2005 – Six operational amplifiers from National Semiconductor Corporation (NYSE:NSM), built on its new, proprietary VIP50 process technology, feature significant improvements in accuracy, low power consumption and voltage noise for industrial, medical and automotive applications.  These improvements, combined with the products’ small size, also make them well suited for portable applications. In a related announcement today, National released details and specifications of its VIP50 process.

As the industry leader in low-power, low-voltage amplifiers, National’s four latest products in this market, the LMV651, LMV791, LPV511 and LPV7215, offer world-class gain bandwidth product performance.  For example, the 12-MHz, unity-gain bandwidth LMV651 amplifier provides 90 percent power savings over major competitive offerings in SOT and SC70 packages. Other products feature sub-1 uA performance and functional operation up to 12V, as well as nanoamp comparators with 6.6 us of propagation delay in SC70 packaging. 

Expanding its precision amplifier portfolio, National is also introducing the LMP7701 and LMP7711, the first products in a series of next-generation operational amplifiers that offer higher performance, sub-300 uV of input offset with guaranteed input bias of less than 200 fA, and up to 12V operation.

“Customers are demanding higher levels of performance with lower power consumption. That’s where advanced process technology allows National Semiconductor to differentiate itself,” said Erroll Dietz, vice president of National’s Amplifier Group.  “With VIP50, National is leveraging its expertise in process technology to create high-performance amplifiers. These six new products allow us to expand our precision line while maintaining our leadership position in low-voltage, low-power products.”

Precision Amplifiers: Femto Amp Input Current for Accurate Sensor Interfacing
The LMP7711 single amplifier offers low current (50 fA) metal oxide silicon (MOS) inputs while still providing low-noise (less than 7nV/sqrt Hz) performance, minimizing distortion and signal- conditioning errors.  Precision thin-film resistors and well-matched transistor pairs are used to guarantee input offset errors of less than 200 uV, increase common-mode rejection ratio (CMRR of 95 dB) and increase power supply rejection ratio (PSRR of 100 dB) performance, while maintaining a low offset voltage drift (TCVos) of 1uV/degrees C over extreme temperatures (-40 degrees C to 125 degrees C).

The LMP7701 precision amplifier operates from 2.7V to 12V supply voltages and has rail-to-rail CMOS inputs with low input-bias current (200 fA).  Trim and design techniques eliminate the large offset glitch associated with conventional CMOS rail-to-rail input amplifiers, improving the input offset voltage of less than 300 uV across the entire common-mode voltage range (0V to 12V).  It also employs a patented correction technique to reduce the large temperature coefficient of the offset voltage commonly found in CMOS precision amplifiers.  Both products are available in a SOT23 package.

Low-Noise Op Amp With Shutdown
The LMV791 low-noise CMOS input operational amplifier offers 5.8nV/sqrt Hz of flat band noise.  Its low offset voltage of less than 1.3 mV and low temperature coefficient of less than 3uV/ degrees C improve overall system accuracy.  The 100 dB PSRR and 95 dB CMRR provide the DC performance needed in high-performance applications. A shutdown feature reduces power consumption to less than 1 uA when in idle mode.  The LMV791 is available in a six-lead TSOT23 package.

Unparalleled Bandwidth-to-Power Ratio
The LMV651’s high-efficiency design provides 90 percent power savings over previous- generation operational amplifiers by consuming only 115 uA while maintaining a 12 MHz unity-gain bandwidth and a low 1/f noise voltage of 17nV/sqrt Hz.  Its less than 1 mV input offset voltage, 100 dB CMRR and 95 dB PSRR improve the overall DC system accuracy across various input voltages and supply voltages.  The LMV651 is offered in an SC70 package.

Ultra-low-power Amplifier and Comparator
The LPV511 micro-power operational amplifier and the LPV7215 micro-power comparator consume less than 900 nA and 600 nA of supply current, respectively. Both products offer rail-to-rail inputs and outputs. The LPV511 is specified for 2.7V to 12V operation, while the LPV7215 comparator is operational from 1.8V up to 5V.  The LPV7215 offers a 6.6 us propagation delay that quickly detects if a voltage fault condition has occurred, sending a precise output response to a microcontroller or other system diagnostic IC.  The space-saving SC70 package and -40 degrees C to +85 degrees C temperature range make these products suitable for continuously on, battery-powered applications, such as smoke detectors, as well as industrial, telecommunications and automotive applications.

VIP50 Process Technology
These six new products are designed on the VIP50 process, a silicon-on-insulator BiCMOS process with trimmable, highly-accurate thin-film resistors created exclusively for the development of advanced analog operational amplifiers and comparators.  The VIP50 process allows National to design a new series of precision operational amplifiers, along with the most power-efficient, low-voltage amplifiers on the market.

Pricing and Availability
The LMP7711, LMP7701, LPV511, LMV791, LMV651 and LPV7215 are available now. The LMP7711 is priced at $1.55 in 1,000-unit quantities. More information, pricing and easy-to-order samples are available at http://www.national.com/appinfo/amps/vip50.html. A large selection of amplifiers is supported by National’s Amplifiers Made SimpleSM,  Signal-Path Designer™ and Active Filter Designer WEBENCH® online design tools.  To explore these solutions, visit http://webench.national.com. To learn more about designing with amplifiers, visit National’s library of online seminars.

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

National’s Unique Portfolio of Operational Amplifiers
National offers a complete portfolio of operational amplifiers ranging from high-speed and low-power to low-voltage and precision.  National also leads the industry with its revolutionary Silicon Dust™ and micro SMD packaging technologies. In addition, National's patented VIP10 process technology enables it to create the industry's broadest suite of high-performance operational amplifiers available today.  For more information on National’s amplifier products, visit amplifiers.national.com.

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, communication interface products and data conversion solutions. National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, California, National reported sales of $1.91 billion for fiscal 2005, which ended May 29, 2005.  Additional company and product information is available at www.national.com.