First and second comparator groups compare first and second analogue signals applied thereto, respectively, with reference voltages and convert the results of the comparison to binary signals to output {HEAD ~ the binary signals} to {TAIL ~ an encoding circuit} 
First and second comparator groups compare first and second analogue signals applied thereto , respectively , with reference voltages and convert the results of the comparison to binary signals to output { HEAD ~ the binary signals } to { TAIL ~ an encoding circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL