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ADC rejects noise in 50 or 60Hz line frequencies

Posted: 02 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:MCP3550? ADC? analog-to-digital converter? Microchip Technology?

Microchip Technology Inc. has announced an addition to its low-power, high-resolution delta-sigma ADC family. Microchip claims that the MCP3550 is one of the lowest-powered, smallest ADCs on the market with greater than 16bit resolution. This new 22bit device is available in an 8-pin MSOP package (3.1-by-3.1-by-1.18mm) and offers low-current operation of 120A, typical. It rejects noise in either the 50Hz or 60Hz line frequencies, which is said to result in highly accurate measurements for consumer, industrial, battery-powered and portable devices.

The MCP3550 features integral nonlinearity of 2ppm typical, power consumption of 0.6mW maximum at 5V and output noise as low as 2.5V root mean square. The device rejects 50 or 60Hz noise greater than 120dB, which makes its measurements impervious to noise from power supplies in these line frequencies, said the company.

The MCP3550-50 (50Hz rejection) has a sample rate of 12.5 samples per second (sps), and the MCP3550-60 (60Hz rejection) has a sample rate of 15sps. Both versions of the ADC offer auto calibration with every conversion, and an extended temperature range of -40C to 125C.

The new ADC targets applications, including: industrial (instrumentation, pressure sensors, weigh scales, handheld meters and multimeters); medical (heart-rate monitors and blood-glucose meters); consumer (weighing scales and handheld meters); and automotive (sensor interfaces).

Sampling and volume production of the MCP3550-50/60 are already available.

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