Noam, DIV = 1 and GAIN = 1 effectively is the same as DIV = 2 and GAIN = 2 in terms of the realized analog output voltage range. Since those two settings are redundant but would be implemented with separate internal circuits, only one is actually production tested to help reduce device cost. DIV = 2 and GAIN = 2 was chosen as the range at final test somewhat arbitrarily - if 0 to VREF is the desired output range then it is suggested to use DIV = 2 and GAIN = 2.
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