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GHz-speed A/D consumes 1.9W

Posted: 29 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? analog-to-digital converter? adc? adc08d1500? adc08d500?

National Semiconductor Corp. today expanded its family of gigahertz-speed ADCs with three converters that are said to offer the industry's best performance with ultra-low power consumption.

The new ADCs are the ADC08D1500, a dual 8-bit converter capable of sampling one analog input at 3Gsamples/s when operating in dual-edge sampling (DES) mode or two inputs at 1.5Gsamples/s, the ADC08D500, a dual, 500MS/s 8bit converter; and the ADC081500, a single version of the ADC08D1500. These devices join the ADC08D1000 and ADC081000 GHz-speed ADCs that were introduced last year.

"Gigahertz sampling speeds and excellent dynamic performance used to be synonymous with high power consumption. Today, National is raising the bar with the first 8-bit ADC capable of sampling signals at 3Gsamples/s while consuming a mere 1.9 W. This A/D converter delivers on both performance and low power consumption," said Antonio Visconti, product line director of National Semiconductor's Data Conversion Division.

Atmel Corp. has also made inroads in the GHz range. In June, the company claimed to have developed the fastest 10bit ADC with a clock frequency of 2.2Gsamples/s.

National's A/D converters' low power consumption of less than 2W enables engineers to design without fans and heat sinks, saving board space, reducing system cost and enhancing system reliability, according to Visconti.

The ADC08D1500 typically achieves 7.2 effective number of bits (ENOB), 45.5dB signal-to-noise ratio (SNR) and 53.4dB spurious free dynamic range (SFDR) at 3Gsamples/s with a 750MHz input signal. The products guarantee no missing codes over the full operating temperature range of -40C to 85C.

The ultra-high-speed 8-bit family is intended for test and measurement equipment such as digital oscilloscopes, digital capture cards, spectrum analyzers and communications transceiver applications.

The ADC08D500 and ADC08D1500 join National's ADC08D1000, a dual gigahertz-speed ADC that outperforms other competitive solutions while consuming significantly less power, Visconti said. Like the ADC08D1000, the ADC08D1500 and ADC08D500 digitize two input signals to 8bit resolution at sampling rates of 1.5Gsamples/s and 500MS/s, respectively, while consuming 1.9W and 1.4W from a 1.9V nominal supply.

In DES mode, the ADC08D1500 achieves sampling speeds up to 3Gsamples/s from one channel by interleaving the two on-chip converters. Both coarse and fine timing adjustments are available, allowing the sampling clock for each channel to be calibrated independently in 0.1ps increments. A three-wire serial bus controls these adjustments, as well as on-chip functionality, and independent gain and offset fine-tuning for I and Q channels.

The ADC08D500, ADC081500 and ADC08D1500 are priced at $125, $215 and $350, respectively, in 1,000-piece quantities.

- Bettyann Liotta


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