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RF430FRL152H: SD14 module as differential

Part Number: RF430FRL152H

HI All 
I am new to this forum so forgive me if i made something wrong 
how can I use the SD14 module to measure differential inputs
i mean for example to measure the signal on ADC1 reference to ADC2
in the datasheet they only giving me the option to select one input by setting SD14INCH bits 
but in the same time they are mentioning that this module is a differential module and you can read signals between vin+ and vin- 
i don't understand this point 
can someone clarify it please 
thank you in advance