Resolution Improvement of ADXL345 Based on Oversampling Techniques Analog Devices\' ADXL345 triaxial accelerometer includes a digital interface and built-in analog-to-digital converter (ADC). The ADXL345 has a high resolution of 3.9 mg/LSB in all g ranges (±2g, ±4g, ±8g, and ±16g), which is suitable for most applications. In applications that require higher resolution, oversampling techniques can be used to improve the resolution of the ADXL345. This application note describes how to improve the resolution of the ADXL345 using a first-in, first-out (FIFO) buffer. Oversampling Principles The first step in digital signal processing of the acceleration signal from an accelerometer is analog-to-digital conversion. For accelerometers with analog outputs, the accelerometer\'s signal is digitized by an external ADC, and its resolution depends on the application\'s requirements and the designer\'s choice. Compared to analog output accelerometers, digital output accelerometers (such as the ADXL345) have an internal ADC, and its resolution is determined by the sensor design.
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