{HEAD ~ means} for comparing {TAIL ~ the SAR conversion time} to a desired conversion time; and 
for comparing
{ HEAD ~ means } for comparing { TAIL ~ the SAR conversion time } to a desired conversion time ; and
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH