JAJSHV5B June 2017 – August 2019 ADS1287
PRODUCTION DATA.
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Offset and gain errors are corrected by the offset and full-scale calibration registers. As shown in Figure 61, the conversion result is first subtracted by the offset register (OFC) and then multiplied by the correction factor derived from the full-scale register (FSC). These operations occur before the 32-bit clip stage. Equation 14 shows the offset and full-scale correction.
The offset and full-scale registers are written directly by the user, or the values are determined automatically as a result of calibration operations. One set of offset and full-scale registers apply for all gain factors. Unique values, depending on system accuracy requirements, may be required for each gain to improve the gain-matching performance. The calibration operation is bypassed in the sinc filter mode.