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National Semiconductor Introduces Industry’s Lowest Noise Precision Amplifier Family

Proprietary VIP50 BiCMOS Process Enables Low Input Voltage Noise of 2.9 nV/sqrt Hz With 1/f Noise Corner of Only 3 Hz

Sep 18, 2007

September 18, 2007 – National Semiconductor Corporation (NYSE:NSM) today introduced two precision operational amplifiers (op amps) that offer the industry’s lowest input voltage noise and highest accuracy for products operating at low frequencies and low supply voltage. Target applications include industrial and scientific weigh scales, pressure sensors and other low ohmic sensor systems.

National’s LMP7731 single and LMP7732 dual precision op amps are the latest additions to the company’s LMP® precision amplifier family and provide low input voltage noise of 2.9 nV/sqrt Hz with a 1/f noise corner of only 3 Hz. They also feature 0 Hz to 10 Hz peak-to-peak noise voltage of 78 nVpp. This ensures highly accurate signal conditioning, while minimizing distortion in low-frequency (near DC) sensor applications. The new LMP precision op amps are built on the company’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.

Additionally, the precision of the LMP7731 and LMP7732 amplifiers supports data acquisition systems of 16-bits 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 analog-to-digital converter (ADC) to ensure optimum sensitivity.

Key Features – LMP7731/32 Low Noise Precision Amplifiers
The LMP7731 single and LMP7732 dual are low-noise, low offset voltage, rail-to-rail input and output (RRIO), low-voltage precision amplifiers. These op amps feature bipolar input stages with input bias cancellation circuitry that lowers the input current to only 1.5 nA. They provide low DC offset voltage at 40 uV, support a supply voltage range of 1.8V to 5.5V and offer a wide gain bandwidth (GBW) of 22 MHz while consuming 2 mA of current. This high gain bandwidth along with a high open-loop gain of 130 dB enables accurate signal conditioning in systems with high closed-loop gain requirements.

The LMP7731/32 op amps offer performance exceeding 120 dB for common mode rejection ratio (CMRR), power supply rejection ratio (PSRR) and large signal voltage gain (AVOL). With an input offset voltage drift (TCVOS) of 1 uV per degrees C, these op amps are able to operate across an extended temperature range of -40 degrees C to 125 degrees C. The LMP7731 and LMP7732 are available in 5-pin SOT23 and 8-pin SOIC packages, respectively.

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
Available now and priced in 1,000-unit quantities, the LMP7731 is $1.15 and the LMP7732 is $1.80. For more information and easy-to-order samples, visit
http://www.national.com/pf/LM/LMP7731.html and http://www.national.com/pf/LM/LMP7732.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 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
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