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National Semiconductor targets base station receivers with new ADC and DVGA

Two new high-speed signal path products, a 16-bit, 130 mega-samples per second (MSPS) analog-to-digital converter (ADC) and a digital-controlled variable gain amplifier (DVGA), were announced today by National Semiconductor Corp. They are part of National's PowerWise® family. The company reports that they deliver the industry's best linearity performance and lowest power for multi-carrier GSM and multi-carrier, multi-standard wireless base station receivers.

The 16-bit ADC16V130 exhibits spurious-free dynamic range (SFDR) performance with 90.6 decibels full scale (dBFS) for a 160 MHz input frequency, and 87 dBFS guaranteed. The ADC provides high-order harmonic distortion performance at any input frequency, and it consumes 755 mW.

The LMH6517 dual DVGA provides a 1.2 GHz bandwidth, along with a third-order output intercept point of +45 dBm and a noise figure of 6 dB. According to National Semiconductor, at 400 mW per channel, the LMH6517 consumes 33 percent less power than the nearest competitive DVGA.

The ADC16V130 is a high-speed ADC capable of converting analog input signals into 16-bit digital words at conversion rates up to 130 MSPS. The ADC uses a differential pipelined architecture with digital error correction and an on-chip sample-and-hold circuit to minimize power consumption. The ADC16V130 also provides full-power bandwidth of 1.4 GHz and a signal-to-noise ratio (SNR) of 78.5 dBFS at 10 MHz input frequency.

The device includes power-down and fast recovery, and features industry-standard low-voltage differential signaling (LVDS) outputs for interfacing to field-programmable gate arrays (FPGAs) and application-specific integrated circuits (ASICs). The ADC16V130 operates over the -40 degrees C to 85 degrees C temperature range and is supplied in a 9 mm by 9 mm, 64-pin LLP package.

The LMH6517 is a dual-channel DVGA designed for use in narrowband and broadband IF sampling applications. The LMH6517 offers a gain range of -9.5 dB to 22 dB in 0.5 dB steps to optimally scale the received signal and maximize the available signal path dynamic range for the ADC. The amplifier's differential input supports differential-to-differential or single-ended-to-differential operation.

The LMH6517 is manufactured on National's new CBC8 silicon germanium (SiGe) complementary bipolar-CMOS process technology. The LMH6517 operates over the -40 degrees C to 85 degrees C temperature range and is supplied in a 5 mm by 5 mm, 32-pin LLP package.
A reference board that includes the ADC16V130 and LMK04031B clock jitter cleaner interfaces directly with National's new WaveVision 5 software and data capture board to simplify the evaluation process.

Available now, the ADC16V130 is priced at $69 in 1,000-unit quantities. For more information and samples, visit www.national.com/pf/DC/ADC16V130.html. The LMH6517 will begin sampling in first quarter 2009 with production quantities scheduled for second quarter 2009. The LMH6517 is priced at $6.90 in 1,000-unit quantities. For more information, or to order samples, visit www.national.com/pf/LM/LMH6517.html.

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