Understanting the icl7107(adc with display)

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I am attempting to understand the 200mV configuration of th icl7107 (fig 1) in the datsheet attached. My question is the analogue ground shorted internally with the power of chip? or is it floating with respect to the supply? Thanks
 

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I am attempting to understand the 200mV configuration of th icl7107 (fig 1) in the datsheet attached. My question is the analogue ground shorted internally with the power of chip? or is it floating with respect to the supply? Thanks
it's floating with respect to the power supply, that's why you have to isolate the power supply of the chip from the analog input being measured.
 
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why is the reference voltage is connected between the 9V supply and the analogue ground?instead connected by the ground of the power supply?
 

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