| 摘要 |
Linearity correction is performed by determining whether a data output value (DOUT) from an analog-to-digital converter (ADC) is in a first subrange or a second subrange. If DOUT is in the first subrange, then DOUT is scaled by a first scaling correction factor (SCF 1 ), and the result is adjusted by a first best fit adjustment value (BFAV 1 ). If DOUT is in the second subrange, then DOUT is scaled by a second scaling correction factor (SCF 2 ), and the result is adjusted by a second best fit adjustment value (BFAV 2 ). The data output range of an ADC can be processed in many ranges of such subranges. Techniques are set forth for determining SCF 1 , SCF 2 , BFAV 1 and BFAV 2 . Employing the linearity correction method allows a low-cost microcontroller having an ADC to perform adequate linearity correction on the ADC output data without having to store an INL lookup table.
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