Speedy ADCs claim best SNR specs

Low noise floor improves accuracy in test and measurement, receiver sensitivity in wireless communications, and image quality in medical, industrial and military applications.

Texas Instruments has developed a family of 16bit single-channel 40 and 80Msample/s A/D convertors it reckons provide the highest available signal-to-noise ratio (SNR) with very low power consumption.

The 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 80Msample/s, and ADS5560, offering 40Msample/s, provide 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 80Msample/s device consuming less than 900mW of power.

The device also offers dynamic power scaling, reducing power consumption to as little as 540mW at 25Msample/s.

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 4.2dB over a 1MHz band in baseband and time-domain applications.

In addition, programmable gain from 0 to 6dB allows full scale outputs to be provided for input signals as low as 2V peak-peak.

To further add to the devices' flexibility, designers can choose between parallel CMOS or fully-differential double datarate (DDR) LVDS outputs, which can enable up to 2dB additional SNR performance.

The ADS5562 and ADS5560 are available now in compact 7 x 7mm, 48-pin QFN packages.

Pricing in 1000-piece quantities is US $48.33 and US $35.00, respectively.

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