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14bit ADC delivers 75.5dBFS at 5MHz

Posted: 21 Nov 2011 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? medical imaging? digital processing block?

Texas Instruments Inc. (TI) has unveiled what it touts as the industry's lowest power 8-channel, 14bit ADC at 80MSPS. The company said the ADS5294 enables power-efficient and cost-effective designs by offering the best noise performance.

The ADS5294 integrates a digital processing block, a low-frequency noise suppression mode and programmable input-to-output mapping. All these features allow system designers to integrate more functions in a smaller footprint, resulting in more compact medical imaging systems, noted TI.

According to the company, the ADS5294 enables designers of high-density applications to increase channel count without increasing power. The device offer 75.5dBFS SNR at 5MHz/80MSPS, 78.2dBFS SNR at 5MHz and decimation filter enabled, 84dBc SFDR at 5MHz/80MSPS and 77mW per channel at 80MSPS (two LVDS wires per channel). It also has a low-frequency noise suppression mode, added the company.

The ADC has a digital processing block that integrates several commonly used system functions such as two- or four-channel averaging and decimation by two, four or eight filters. The digital processing block can be used to significantly improve SNR and filter harmonics, while reducing output data rate for narrow-band applications, continued TI.

Using the ADS5294, digital data can be output over one or two wires of LVDS pins per channel, reducing the number of interface lines. This creates a two-wire interface which keeps the serial data rate low allowing designers to use low cost FPGAs. In addition to medical imaging systems, the ADS5294 brings the same benefits to radar, communications, test and measurement and other multichannel data acquisition applications.

The ADS5294 is available in a 12 x 12mm, 80-pin QFP package. The ADS5294 is priced at $84 in quantities of 1,000. To provide a flexible environment for testing the ADS5294 under many conditions, an evaluation module (EVM) is available. The ADS5294 EVM is priced at $299.

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