{HEAD ~ The predetermined digital control word} is selected as {TAIL ~ a function} of the bit being converted and the preceding bits 
is selected as
{ HEAD ~ The predetermined digital control word } is selected as { TAIL ~ a function } of the bit being converted and the preceding bits
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH