An A/D converting circuit converts {HEAD ~ the output voltage} of the amplifying circuit into {TAIL ~ a digital value} by comparing it with reference voltage, and outputs it 
into
An A / D converting circuit converts { HEAD ~ the output voltage } of the amplifying circuit into { TAIL ~ a digital value } by comparing it with reference voltage , and outputs it
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH