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National readies ADC, DVGA for complex receivers

Posted: 17 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:base station? receiver? ADC?

Two new high-speed signal path products, a 16bit, 130MSps ADC and a digital-controlled variable gain amplifier (DVGA), have been launched by National Semiconductor.

They are part of National's PowerWise family. The company claimed that they deliver the industry's best linearity performance and lowest power for multicarrier GSM and multicarrier, multistandard wireless base station receivers.

The 16bit ADC16V130 displays spurious-free dynamic range performance with 90.6dBFS for a 160MHz input frequency and 87dBFS guaranteed. The ADC offers high-order harmonic distortion performance at any input frequency, and it uses 755mW.

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

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

The device includes power-down and fast recovery, and has industry-standard LVDS outputs for interfacing to FPGAs and ASICs. The ADC16V130 operates over the -40C to 85C temperature range and is supplied in a 9mm x 9mm, 64-pin LLP package.

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

The LMH6517 is produced on National's new CBC8 SiGe complementary bipolar-CMOS process technology. The LMH6517 works over the -40C to 85C temperature range and is supplied in a 5mm x 5mm, 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 ease the evaluation process.

- RF Designline

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