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12-/16bit ADCs generate less noise for medical apps

Posted: 07 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? data conversion? medical application?

Analog Devices Inc. expands its portfolio of precision sigma-delta ADCs with 12- and 16bit small-package devices. The 12bit AD7170 ADC and 16bit AD7171 ADC have 125Hz output data rate and generate less noise than competing converters while consuming 25 percent less current. They are designed for portable instrumentation, industrial process controls, medical monitoring devices, and other applications that require reliable, highly accurate signal conversion on a tight power budget within a confined PCB area.

The AD7170 and AD7171 achieve 12- and 16bit noise-free resolution, respectively, meeting the demanding performance specifications of equipment used to precisely monitor patient vital signs and measure real-world instrumentation phenomena, such as pressure and temperature.

Key features of the ADCs include integral nonlinearity of 0.1 least significant bit at 12bits (AD7170) and INL of 0.4 LSB at 16bits (AD7171); power consumption of 110?A , or 5?A in power-down mode; ease-of-use, fixed sampling rate; no programming required; an on-chip oscillator; and it all comes in a 3mm x 3mm CSP package.

Complementary components for the AD7171 ADC include the ADR5041 precision reference and the AD8628 precision amplifier. For the AD7170 ADC, the ADR5041 precision reference and the AD8631 precision amplifier are recommended.

The 3mm x 3mm 10-lead LFCSP AD7170 and AD7171 ADCs are available now. They are priced at $0.95 and $1.15 each, respectively, for quantities of 1,000.

For application notes on ADCs click here.

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