JAJSP39A May 2022 – December 2022 ADS1285
PRODUCTION DATA
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Gain correction is through a 24-bit word, consisting of three 8-bit registers (high address = MSB). The gain value is 24 bits, coded in straight binary and normalized to 1.0 for GAIN[23:0] equal to 400000h. With a calibration signal applied, gain error is calibrated by either the gain calibration command, or by collecting ADC data and writing a computed value to the gain registers. Table 8-9 lists examples of the GAIN[23:0] register values. Although the range of gain values can be much greater or less than 1, the sum of offset and gain correction must not exceed 106% of the uncalibrated range.
GAIN[31:0] | GAIN CORRECTION FACTOR |
---|---|
433333h | 1.05 |
400000h | 1.00 |
3CCCCCh | 0.95 |