Wednesday, December 07, 2005

A Reference Design for High-Performance, Low-Cost Weigh Scales

The accuracy required by weigh scales is not initially obvious. Their typical resolution is only 1:3,000 to 1:10,000, so a 12- to 14-bit ADC would seemingly be adequate. A closer examination shows that this is not case, however, and that a 20-bit ADC is really required. This article introduces weigh scale system specifications and design considerations, including noise, dynamic range, offset drift, gain drift, and filtering.

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