Output code of AD7321

Question How does the sign-bit together with other 12-bit (Straight binary or 2-complement) to form a integral code? Answer Straight binary & bi-polar :if MSB is 1, the input is positive; if MSB is 0, the input is negative Straight binary & uni-polar :if MSB is 1, the input is in upper half of the selected range 2-complement: if MSB is 0, the input is positive; if MSB is 1, the input is negative When in differential mode the “no missing code” resolution is 13-bits. When in single ended mode the “no missing code” resolution is 12-bits The reading back results over the SPI port you should see the following 0b00arrrrrrrrrrrrr (13 r bits) a is ADD0 and corresponds to the channel that the results is from. 13 bits rr.rrrr which contain the result, SIGN is always the MSB of the result irrespective of the mode.