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TI’s 14-bit ADC unites speed and efficiency

May 23, 2009

BANGALORE, INDIA: Texas Instruments Inc. (TI) recently introduced a dual, 14-bit analog-to-digital converter (ADC), the ADS62P49, at 250MSPS to deliver a premier combination of wide signal bandwidth, high dynamic performance and low power consumption.

The ADS62P49 achieves 73-dBFS signal-to-noise (S/N) ratio and 85-dBc spurious-free dynamic range (SFDR) at an input frequency of 60 MHz. I was able to catch up with Apoorva Awasthy, Business Development Manager, High Performance Analog, Texas Instruments India, to find out more about this new 14-bit ADC.

Chief features of TI 14-bit ADC
Texas Instruments (TI) has united speed and efficiency with the industry’s fastest dual, 14-bit ADC at 250 MSPS. Key features of this device include:

* It delivers a premier combination of wide signal bandwidth, high dynamic performance and low power consumption;
* Fastest dual, 14-bit ADC at 250MSPS enables multi-channel, wide-bandwidth sampling without sacrificing dynamic performance, for enhanced accuracy in portable test equipment;
* Low power of 625 mW per channel reduces thermal footprint for increased system efficiency in high-density, multi-antenna base station receivers and software defined radios;
* Programmable gain and other user-selectable settings maximizes design flexibility;
* Complete signal chain with comprehensive evaluation tools suite speeds time to market; and
* It is first in a series of four 12- and 14-bit dual channel ADCs with sample rates of 210MSPS and 250MSPS, respectively.

TI also says that the 250-MSPS data converter provides 66 percent greater bandwidth than competing dual ADCs. Has this been based on any on-field performance? Awasthy said that this is the performance specified in the data sheet and was tested in a lab.

Naturally, the key application areas would be interesting to look at! Awasthy said, “The ADS62P49 is suitable for applications such as communications and defense imaging systems, and wide-band test and measurement equipment. The block diagram given here shows an application area.Source: TI

Again, when TI says that the ADS62P49 has the “the industry’s fastest sample rate”, what’s the benchmark? Awasthy said, “We have done comparisons between our device and others in the industry. We are the only one to offer a dual, 14-bit device that achieves 250MSPS.”

Solving customer challenges
What are the main customer challenges solved by the new ADC? Awasthy said: “Communications, defense and test design engineers are constantly challenged to create signal and data acquisition receivers with increasingly wide signal bandwidths that do not compromise overall system performance. Another key feature in demand is the low power capabilities without bargaining on performance.

“TI addresses these challenges with the ADS62P49, which delivers high-performance, compact, power-efficient designs, and enables rapid deployment of 3G and 4G systems, software defined radios and spectrum analyzers.”

What if the competition brings out such a device or a better one soon? TI is not in a position to speculate on what the competition is planning. “The data converter market offers tremendous opportunities to TI. We will continue to offer leading edge data converters that address our customers’ challenges and advance next generation system design,” he added.

This is the first in a series of four 12- and 14-bit dual channel ADCs. Awasthy said that TI expects more of such devices to be released in the second half of this year.

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