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1MSps, 16bit ADCs cut power consumption, board space

Posted: 09 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Analog Devices? AD7980? ADC? PulSAR? A/D converter?

Analog Devices says its AD7980, a 1MSps 16bit ADC in the company's PulSAR family, consumes 80 percent less power and board space than the closest competing 16bit converter. "Offering five times lower power per conversion, combined with outstanding AC and DC linearity, the AD7980 will afford remarkable benefits to end users across many varied applications," said Dick Meaney, VP of the precision signal processing group at ADI.

The AD7980 features 7.5mW power consumption at 1MSps and 75mW at 10KSps, the lowest power of any 16bit ADC at any sample rate, according to the company. Other performance enhancements include 2-LSB maximum INL and 91.5dB SNR at 20kHz.

Designed to increase the portability of patient (medical) and industrial monitors and improve the performance and throughput of automated test equipment (ATE) and DAQ systems, the AD7980's small package size and reduced power consumption lends it to lightweight, wearable electrocardiograms (EKGs), blood pressure monitors, oxygen sensors and other medical instruments that wirelessly transmit patient information to a data center or the nurses' station. In industrial equipment, the chip's fast sampling rate and low power consumption allow designers to place critical components closer together to improve system performance and speed.

The chip is also easily designed into analog sensor packages. This new breed of highly integrated "smart sensors" eliminates the parasitic effects, signaling errors and delayed response time caused when the ADC is physically separated from the sensor using signal cables.

AD7980, available in LFCSP/QFN and MSOP packages (five and three times smaller, respectively, than competing products), is priced at $19.50 each in 1,000 quantities. AD7980 is pin-compatible with the AD768x MSOP family of 16bit PulSAR ADCs, and works well with the company's ADA4841 driver and buffer op-amps and ADR42x, ADR43x, and ADR44x voltage references.

- Vince Biancomano

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