DVGAs from National Semiconductor Enable Higher-Performance Basestation Radio Architectures

SANTA CLARA, Calif., Aug. 10, 2011 /PRNewswire/ -- National Semiconductor Corp. (NYSE: NSM) today introduced a pair of quad- and dual-channel, digital variable gain amplifiers (DVGA) that enable higher-performance wideband radio systems. The LMH6522 quad and LMH6521 dual DVGAs provide superior linearity performance over a wide frequency range, making them an ideal solution for the most challenging multi-channel wideband wireless systems. Target applications include intermediate frequency (IF) sampling receivers, I/Q digital pre-distortion (DPD) signal paths and wide-bandwidth direct-conversion radios used in multi-carrier GSM, TD-SCDMA, W-CDMA and LTE wireless basestations.

Radio designers face the challenge of producing cost effective anti-alias filters (AAF) that meet the demanding requirements of today's wider radio bandwidths. The flexibility to select from a range of filter impedance levels, including low impedance levels such as 50-Ohms, not only simplifies the AAF design, but also improves performance and manufacturability. National's DVGAs are optimized for driving a wide range of load impedances. Their low-Z output drive delivers exceptional signal fidelity and provides the additional power gain needed when driving low impedance filters.

The LMH6522 and LMH6521 are well-suited for driving high-speed ADCs, including National's ADC16DV160 dual 16-bit, 160 MSPS converter. In addition, the LMH6521 is ideal for driving National's ultra-high-speed ADC12D500/800RF 12-bit, 500 MSPS/800 MSPS direct RF-sampling ADCs. By adding the LMX2541 frequency synthesizer and one of National's family of LMK04800 or LMK04000 clock jitter cleaners, a designer can form a complete signal path.

Key Features of the LMH6522 Quad DVGA

• OIP3: 49 dBm at 200 MHz input frequency
• Precise 1 dB gain steps over a wide 31 dB range
• Noise figure of 8.5 dB at maximum gain
• Supplied in a 54-pin LLP® package

Key Features of the LMH6521 Dual DVGA

• OIP3: 48.5 dBm at 200 MHz input frequency
• Channel gain/phase matching of +/- 0.04 dB / +/- 0.45 deg
• Precise 0.5 dB gain steps over a wide 31.5 dB range
• Noise figure of 7.3 dB at maximum gain
• Supplied in a 32-pin LLP package

Pricing and Availability

Available now, the LMH6522 is priced at $9.85 and the LMH6521 is $6.15, both in 1,000-unit quantities. For more information on the LMH6522 quad DVGA or to order samples and an evaluation board, visit http://www.national.com/pf/LM/LMH6522.html. For more information on the LMH6521 dual DVGA, visit http://www.national.com/pf/LM/LMH6521.html.

Note to editors:  To view a high-resolution downloadable photo of these products, visit http://www.national.com/news/images/LMH652x.jpg.

About National Semiconductor

National Semiconductor is a leader in power management technology. Known for its easy-to-use analog integrated circuits and world-class supply chain, National's high-performance analog products enable its customers' systems to be more energy efficient. Headquartered in Santa Clara, Calif., National reported sales of $1.52 billion for fiscal 2011. Additional information is available at www.national.com.

National Semiconductor and LLP are registered trademarks of National Semiconductor Corporation. All other trademarks are the property of their respective owners.

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SOURCE National Semiconductor Corp.