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ADS8688AT: Floating Input Pin Data Request

Part Number: ADS8688AT

Hello, 

My design uses your part ADS8688ATDBT and we have a failure more where the input pin can be floated.  Looking at the data sheet, it is stated that floating those pins will not be pull down to ground, but instead be pulled to an internal biasing voltage.   Looking at the channel for this particular failure case we are seeing around 1.6Vdc, which is our circuits normal operating window.  We would like to detect this failure mode without making hardware changes.  Is there any data that the ADC provides when such a case exists or the range that the biasing voltage can be?