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A/D converter rejects line-frequency noise, thereby enhancing measurement accuracy
Feb 21, 2006 12:19 PM 

Microchip Technology Inc. has introduced its MCP3550, which is one of the lowest-power and smallest A/D converters on the market with greater than 16-bit resolution. This 22-bit device is available in an eight-pin MSOP package (3.1 mm x 3.1 mm x 1.18 mm) and consumes just 120 microamperes. It rejects either 50 Hz or 60 Hz line noise enabling highly accurate measurements in industrial, battery-powered and portable devices.

The A/D converter features integral nonlinearity (INL) of ±2 ppm, typical, power consumption of 0.6 mW maximum at 5 V, and output noise as low as 2.5 mV rms. The device rejects 50 Hz or 60 Hz noise greater than 120 dB, which makes its measurements impervious to noise from power supplies at these line frequencies.

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

Sampling and volume production of the MCP3550-50/60 are available. The devices are priced at $3.20 each in 10,000-unit quantities for the eight-pin SOIC package, and $3.23 each in 10,000-unit quantities for the eight-pin MSOP package.


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