SLVSDR1A February 2018 – April 2020 ADC08DJ3200
PRODUCTION DATA.
The input offset voltage for each input can be adjusted through the SPI register. The OADJ_A_INx registers (registers 0x08A and 0x08D) are used to adjust ADC core A's offset voltage when sampling analog input x (where x is A for INA± or B for INB±). OADJ_B_INx is used to adjust ADC core B's offset voltage when sampling input x. These registers apply to both dual channel mode and single channel mode. To adjust the offset voltage in dual channel mode simply adjust the offset to the ADC core sampling the desired input. In single channel mode, both ADC core A's and ADC core B's offset must be adjusted together. The difference in the two core's offsets in single channel mode results in a spur at fS/2 that is independent of the input. These registers can be used to compensate the fS/2 spur in single channel mode. See the Calibration Modes and Trimming section for more information.