GHz-speed A/D consumes 1.9 W

Santa Clara, Calif. — National Semiconductor Corp. today expanded its family of gigahertz-speed analog-to-digital converters with three converters that are said to offer the industry's best performance with ultra-low power consumption.

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

Click here to see a product review on National Semi’s ADC08D1000 at eeProductCenter.

“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 A/D converter capable of sampling signals at 3 Gsamples/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. (San Jose, Calif.) has also made inroads in the GHz range. In June, the company claimed to have developed the fastest 10-bit A/D converter with a clock frequency of 2.2 Gsamples/s.

Click here to see a product review on Atmel’s AT84AS008GL at eeProductCenter.

National's A/D converters' low power consumption of less than 2 W 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), 45.5 dB signal-to-noise ratio (SNR) and 53.4 dB spurious free dynamic range (SFDR) at 3 Gsamples/s with a 750-MHz input signal. The products guarantee no missing codes over the full operating temperature range of -40°C to +85°C.

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 A/D converter that outperforms other competitive solutions while consuming significantly less power, Visconti said. Like the ADC08D1000, the ADC08D1500 and ADC08D500 digitize two input signals to 8-bit resolution at sampling rates of 1.5 Gsamples/s and 500 Msamples/s, respectively, while consuming just 1.9 W and 1.4 W from a 1.9-V nominal supply.

In DES mode, the ADC08D1500 achieves sampling speeds up to 3 Gsamples/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 0.1 picosecond 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.

See ADC08D1500 block diagram

The ADC08D500, ADC081500 and ADC08D1500 are priced at $125.00, $215.00 and $350.00, respectively, in 1,000-piece quantities. Click here for the ADC08D500 data sheet. Click here for the ADC081500 data sheet. Click here for the ADC08D1500 data sheet.

National , 1-800-272-9959,

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