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ADuC7061 about 'ADC0 gain of 1. Buffer of negative input is bypassed'

Question asked by Jiro on Mar 30, 2016
Latest reply on May 17, 2016 by Jiro

I'd like to know the following sentence on page 46 in detail. 

'ADC0PGA[3:0]. [0000] = ADC0 gain of 1. Buffer of negative input is bypassed.'

Does it mean that the negative input pin connect to switched-capacitor input through the mux?

Can't the negative input pin connect to high impedance source directly when PGA is used with gain of 1?

I wonder if I should drive with an op amp when it is used with gain of 1.

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