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ADCs use only 275mW/channel at 250MSps

Posted: 03 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? converter? power management?

Texas Instruments Inc. introduces the first in a new class of high-speed ADCs that deliver ultralow-power consumption. Offering dynamic performance across wide signal bandwidths from DC up to 550MHz, the 14bit ADS4149 consumes 30 percent less power than the nearest low-power ADC the maximum sample rate of 250MSps. It also delivers 3dB greater SNR. This power and performance enables efficiency and density while enhancing range and sensitivity in defense, test and measurement, and communications applications.

"Designers of wide-bandwidth applications are challenged to deliver smaller, more portable systems with increased efficiency, while still meeting the highest performance specifications," said Art George, senior VP of TI's high-performance analog business unit. "This new class of ADCs sets low power benchmarks and allows designers to create denser and more compact systems that extend battery life in radios and test equipment."

The ADS4149 consumes as little as 275mW per channel at 250MSps, while offering 72.5-dB SNR at 100MHz input frequency. Dynamic power scaling reduces power consumption to 215mW at 160MSps.

The device also features optional buffered analog input that provides constant input impedance across time and frequency and eliminates sample-and-hold kickback, simplifying input matching for passive and active analog front ends, while reducing pass band ripple. A 1- to 6dB programmable gain option gives customers flexibility to trade off between SNR and spurious free dynamic range with lowered input voltage swing.

The family also includes pin-compatible 12- and 14bit options at 160- and 250MSps and buffered devices to enable customers to easily move to lower resolutions and samples rates without altering their core design.

In addition, migration path from the ADS6149 allows customers to shift to lower power options. TI's TSW1200 digital capture tool facilitates rapid analysis of the ADS4149 evaluation module (EVM). Available high-speed mezzanine connector and FPGA mezzanine connector allow ADS4149 EVMs to mate to FPGA EVMs for system-level prototyping to speed development time.

The ADS4149 and companion single configuration parts are available in a 48-pin QFN package. It is priced at $89 in 1,000-unit quantities. Multi-channel options will be available in 1H 10.

For application notes on ADC click here.

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