Understanting the icl7107(adc with display)

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The ICL7107's analog ground is floating with respect to the power supply, necessitating isolation between the chip's power supply and the analog input. This configuration is crucial for accurate measurements in the 200mV setup. The reference voltage is connected between the 9V supply and the analog ground rather than the power supply ground to maintain this isolation. This design helps prevent interference and ensures reliable operation of the ADC. Understanding these connections is essential for proper implementation of the ICL7107.
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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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smuscat said:
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.
 
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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