The ADC still has a resolution as advertised, but accuracy suffers with the LSBs. ![]() A common experience is to see a solid conversion of several bits wide with an unpredictable, nonsensical behavior from the last, or least significant bits (LSB). The accuracy as stated in the datasheet will always be equal to or less than the resolution of the converter, with most experiences in the “less than” category. Accuracy is determined by the DC specifications for gain, offset, and linearity (integral nonlinearity and differential nonlinearity). That is, accuracy reflects how true the ADC’s output reflects the actual input. The accuracy of a converter refers to how many bits, from conversion to conversion, are repeatable. Higher resolution correlates to a slower conversion rate. For example, a converter with 12 bits of resolution is often referred to as “12 bits wide,” since 12 bits get processed in each conversion cycle. (Source: Maxim Integrated, Application Note 5384).įor converters, resolution is the number of bits per conversion cycle that the converter is capable of processing. Here, we review some common specifications for successive approximation register (SAR) and sigma delta analog to digital converters (ADCs.) Figure 1: Standard ADC noise performance.
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