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ADS124S08-EXCEL-CALC-TOOL: Can not change the ref volage

Part Number: ADS124S08-EXCEL-CALC-TOOL
Other Parts Discussed in Thread: ADS124S08

Dear Sirs

I'm going to be using the ADS124S08 ADC.  I down loaded the ADS1x4S0x Calculator to help in the design.  I can't change the Reference Voltage in the Code Conversion tab or the Calibration tab.  I enter 5 and get a message "The reference voltage should be between 0.5V and 2.6V.  The nominal value is 2.5V.".  I would think this value should be able to be changed.  Is this a bug or an intended restriction or am I doing something wrong?  I've tried changing the registers so as to allow for the external reference to be used but that didn't work.  Please help.  Thank you.