Photoelectric conversion apparatus and image pickup system

A photoelectric conversion apparatus comprising:

• a pixel array in which a plurality of pixels is arranged in rows and columns;
• signal processing units that are provided in correspondence with the columns of the pixel array, the signal processing units including a plurality of analog-to-digital converters that converts signals output from the plurality of pixels into digital signals;
• an output unit having two or more output terminals and including a plurality of output blocks provided in correspondence with the output terminals;
• and
• a synchronizing signal generating unit for outputting a synchronizing signal,
• wherein signal processing units in a plurality of columns are arranged as a block,
• wherein the plurality of output blocks outputs signals output from a plurality of signal processing units that belongs to the same block, and
• wherein the photoelectric conversion apparatus further comprises a synchronizing code adding unit for adding a synchronizing code to the signals output from each of the plurality of output blocks, in synchronization with the synchronizing signal,
• wherein the synchronizing code includes information regarding a position of the output block.