I found out myself: If there are 0A, when voltage after OPV (I-TOTAL) is 1.65V. This means there is an offset. This Offset will be corrected in software (calibration). So after correction the values are 0 for 0A and half of ADC-Range (2047) for 8.6A. This is why the multiplication with two is necessary to convert _IQ(-0.5)~_IQ(0.5) to _IQ(-1.0) ~ _IQ(1.0) .
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