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General Oversampling of MSP ADCs for Higher Resolution
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2016-12-08
张瑾
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Most often an MSP microcontroller from the device portfolio can be selected that meets all of the application requirements, including footprint size, memory capacity, peripherals included, and cost. But then it can sometimes be disclosed that the analog-to-digital converter (ADC) resolution is lower than desired, a requirement which may be critical enough to make the user consider other options that do not fit their design needs as adequately. An alternative to this outcome would be incorporating a softwarebased oversampling method to obtain extra bits of ADC resolution. The following sections of this application report examine the theory behind oversampling and discuss in detail how software algorithms are employed to achieve the extra resolution desired. An example project that has been designed for operation across various ultra low-power MSP MCU modules, sample frequencies, and desired extra bits of resolution is also provided to instruct and advise the user regarding how their current application can be modified to integrate the ADC oversampling solution with ease.
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