AD7738 Zero and Full scale System Calibration

Question

AD7738 circuit details: 
 REFIN+ and AINCOM connected to 2.5V reference, REFIN- connected to ground . 
 Analog input voltage ranges selected as +/- 1.25V . 
 MUXOUT+=ADCIN+ and MUXOUT-=ADCIN- 
 AVDD connected to 5V 
 What is the range (min and max) of external voltage that can be connected to perform 
 
 Zero scale System calibration 
 Full scale System Calibration

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AD7738 Zero and Full scale System Calibration