The invention provides a current data amplifier circuit of which output
current value is accurate even when transistors with large variation in
electrical characteristics are used. According to the invention, a
plurality of transistors configuring a driving element is used in a
series connection state when inputting current and in a parallel
connection state when outputting current. Thus, is it significantly
suppressed that the variation are not reflected on the output current
value even when the plurality of transistors configuring the driving
element have variation.