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National’s Latest Differential Amplifiers Drive New 12-Bit, 65 MSPS ADCs for Excellent Signal Conditioning and Acquisition

National Semiconductor Provides High-Speed Analog Signal-Path Solutions for Test and Measurement, Medical Imaging and Communications Applications

Mar 28, 2005

March 28, 2005 - National Semiconductor Corporation (NYSE:NSM) today announced two high-speed, low-distortion differential amplifiers and two high-speed, low-power, 12-bit analog-to-digital converters (ADCs) that form a high-performance, high-fidelity and low-power signal-path solution. National’s LMH6550 and LMH6551 amplifiers are optimized for driving high-speed ADCs such as the new 12-bit ADC12DL040 and ADC12DL065

The analog signal path is the heart of demanding applications such as ultrasound imaging and communications systems.  Signal fidelity is determined primarily by the quality of the amplifiers and ADCs.  In ultrasound systems, for example, high-fidelity signals provide superior imaging and more accurate diagnostics.  In communications systems such as cellular base stations, the benefits are clearer reception and fewer dropped calls. 

“Engineers are increasingly demanding the highest possible accuracy for real-world analog signal capture at the lowest possible power consumption,” said Suneil Parulekar, senior vice president of National Semiconductor’s Analog Products Group.  “National’s new combination of high-performance amplifiers and ADCs provides the most accurate signal capture at the lowest power consumption.”

Engineers who want to learn more about signal-path design may attend National’s Signal Path seminars, which are being held in cities throughout Europe and the United States from April 4 to May 20.  Participants can register for the free, day-long events at www.national.com/analogseminars.

The LMH6550 and the ADC12DL040 operate seamlessly to provide a high-quality signal-path solution.  Lab measurements show that the pair produces 11.1 effective number of bits (ENOB) and 80 dB of spurious free dynamic range (SFDR) with a 20 MHz input frequency.  With this guaranteed performance, engineers can confidently implement National’s signal-path solutions in their designs.

About the ADC12DL040/065 ADCs
The ADC12DL040 and ADC12DL065 are dual, high-performance, low-power ADCs capable of converting analog input signals into 12-bit digital words at 40 and 65 MSPS (mega-samples per second), respectively.  These ADCs provide excellent dynamic performance and 250 MHz full-power bandwidth. Operating on a single 3 V power supply, the ADC12DL040 achieves 11.1 ENOB with input signals up to 20 MHz and consumes just 210 mW at 40 MSPS.  The ADC12DL065 achieves 11.0 ENOB with signals up to 32.5 MHz and consumes 360 mW at 65 MSPS.  National recently introduced two other 12-bit ADCs, the dual, 66 MSPS ADC12DL066 and the single, 80 MSPS ADC12L080, which are also optimized for signal-path applications.

About the LMH6550/51 Operational Amplifiers
The LMH6550 and LMH6551 are fully differential, high-speed amplifiers designed for driving 10- to 14-bit, high-performance ADCs such as the ADC12DL040 and ADC12DL065. Both amplifiers have fully differential voltage feedback topology, which allows balanced inputs to ADCs, and they can be used either as single-ended-to-differential or as differential-to-differential amplifiers.  The LMH6550 has SFDR of -86 dBc at 10 MHz, wide 400 MHz bandwidth and high 3000 V/us slew rates. It also has a 10 ns shutdown/disable function and operates at +5 V or +/-5 V supply voltages. The LMH6551 has SFDR of -85 dBc at 10 MHz, wide 370 MHz bandwidth and high 2400 V/us slew rates. It also has an output balance error of -70 dB and operates at +3 V, +5 V or +/-5 V supply voltages.

Pricing and Availability
The LMH6550 and LMH6551, available now in SOIC-8 packaging, are priced at $2.29 and $1.60, respectively, in 1,000-unit quantities.  The ADC12DL040, available now in a TQFP-64 package, is priced at $15 in 1,000-unit quantities.  The ADC12DL065, available in April and packaged in a TQFP-64, will be priced at $17 in 1,000 unit quantities.  Lead-free package options are also available.  More information about these products and National’s other signal-path solutions is available at http://signalpath.national.com

Note to editors: To view a high-resolution downloadable photo of these products, please visit http://www.national.com/company/pressroom/gallery/dcs.html.

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-performance 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 markets include wireless handsets, displays, PCs and laptops.  The company's analog products are also optimized for numerous applications in a variety of electronics markets, including medical, automotive, industrial, and test and measurement.  Headquartered in Santa Clara, California, National reported sales of $1.98 billion for fiscal 2004, which ended May 30, 2004.  Additional company and product information is available at www.national.com