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National Semiconductor’s New Low-Noise CMOS Operational Amplifier Operates up to 24V

LM6211 Is Well-Suited for Industrial and Telecommunication Applications With High Impedance Sources

Mar 14, 2006

March 14, 2006 – A new, rail-to-rail output CMOS operational amplifier from National Semiconductor Corporation (NYSE:NSM) offers a wide operating range up to 24V and meets the demanding low-noise, low-power and low-input bias requirements of industrial and telecommunications applications. 

The LM6211 is a 20 MHz wide-bandwidth, low-noise operational amplifier with a single supply- voltage range of 5V to 24V and a 0.5 pA low input bias current for easy interface with high impedance sources. With an input voltage noise of 5.5 nV/sqrt Hz at 10 kHz and 10 fA/sqrt Hz input current noise, the LM6211 improves signal fidelity found in wireless and sensor interface applications. In addition, its low input capacitance ensures stability when used at high-frequencies or in high-gain sensor applications. To accurately monitor voltage conditions with minimal system power consumption, the LM6211 draws a low supply current of less than 1 mA. 

Key Features and Benefits
The LM6211, built on National’s proprietary power vertically integrated PNP or PVIP family of BiCMOS processes, has a CMOS input stage that enables high-input impedance sources and higher-bandwidth operation.  This op amp has guaranteed performance from -40 degrees Celsius to 125 degrees Celsius. It also has an output short-circuit current, which limits the current to 25 mA, and a slew rate of 5.6 V/us.

The LM6211’s rail-to-rail output stage remains stable with capacitive loads as high as 500 pF, providing the maximum possible dynamic range at the output. The dynamic range is important for applications requiring a large output swing, such as wideband, phase-locked loop (PLL) synthesizers, which need an active loop filter to drive a wide frequency range voltage-controlled oscillator (VCO).

The LM6211 can be used with larger resistors due to its smaller input capacitance of 5.5 pF at 24V, providing more gain without instability. This also makes the LM6211 ideal for wideband transimpedance amplifiers, which require a wide bandwidth, low input referred noise and low input capacitance. The op amp also is well-suited for low-noise applications that require an operational amplifier with very low input bias currents and a maximum output voltage swing of 24V, such as an active loop-filter for PLLs.

Pricing and Availability
Available now in a SOT23-5 package, the LM6211 is priced at $1.19 in 1,000-unit quantities.  Lead-free package options are also available.  For more information on the LM6211 or to order samples, visit http://www.national.com/pf/LM/LM6211.html
.  A large selection of amplifiers is supported by National’s Amplifiers Made SimpleSM WEBENCH® online design tool.  To explore these solutions, visit http://webench.national.com. To learn more about designing with amplifiers, visit the library of online seminars.

Note:  To view a high-resolution, downloadable photo of these products, visit National's http://www.national.com/company/pressroom/gallery/oa.html.

About National’s Amplifier Portfolio
Specializing in high-performance amplifiers and comparators, National Semiconductor offers a complete portfolio of op amps ranging from building-block chips to application-specific standard products (ASSPs), including precision, high-speed, low-power and low-voltage amplifiers. The company has a long history of innovation in amplifiers, including the first low-voltage op amp and the “amp-in-a-mic.”  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.

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