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Family of ADCs promise highest SNR

Posted: 14 May 2008     Print Version  Bookmark and Share

Keywords:ADC  SNR  test and measurement  dynamic power scaling 

Texas Instruments Inc. has introduced a family of 16bit, single-channel, 40MSps and 80MSps ADCs that guarantee the highest SNR with very low power consumption. These new devices' low noise floor improves accuracy in test and measurement, receiver sensitivity in wireless communications, and image quality in medical, industrial and military applications.

The ADS5562, featuring a sample rate of 80MSps, and ADS5560, offering 40MSps, promise the highest SNR for input frequencies within the first Nyquist zone while consuming very little power. For instance, the ADS5562 offers 6dB greater SNR and 0.6 more effective bits than any other 80MSps device consuming less than 900mW of power, the company said. The device also offers dynamic power scaling, reducing power consumption to as little as 540mW at 25MSps.

The ADS5562 and ADS5560 include an array of other digital features to give designers added flexibility. To further reduce noise, the devices offer a low-frequency noise suppression mode to eliminate the 1/f (flicker) noise, improving SNR by up to 4.2 dB over a 1-MHz band in base band and time-domain applications. In addition, programmable gain from 0 dB to 6 dB allows full-scale outputs to be provided for input signals as low as 2 Volts peak to peak (Vpp). To further add to the devices' flexibility, designers can choose between parallel CMOS or fully-differential DDR LVDS outputs, which can enable up to 2 dB additional SNR performance.

The ADS5562 and ADS5560 are available in a compact 7mm x 7mm, 48-pin QFN package. Pricing is listed below for each device in 1,000-piece quantities. Samples, EVMs and capture cards for a rapid and cost-effective evaluation are available.

ADS5562, ADS5560

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