CONNECTION CIRCUIT AND COMMUNICATION INTERFACE

To suppress a direct current flowing from a data source to a termination load in a preceding stage of a transmission circuit without arranging chip capacitance between the data source and a transmission interface.SOLUTION: A connection circuit 10 according to the present invention is connected to a preceding stage of a transmission circuit 14 to which a data signal is input. The connection circuit includes a voltage initial value holding unit 101 and a termination load 102 connected in series with the voltage initial value holding unit 101. The voltage initial value holding unit 101 outputs to the termination load 102 a voltage initial value when the data signal is yet input, and sets both ends of the termination load 102 to the same potential by a direct current component.SELECTED DRAWING: Figure 1 【課題】データのソースと送信インターフェースの間にチップ容量を配置することなく、データのソースから送信回路の前段の終端負荷に流れる直流電流を抑制する。【解決手段】本発明に係る接続回路１０は、データ信号が入力される送信回路１４の前段に接続される接続回路であって、電圧初期値保持部１０１と、電圧初期値保持部１０１と直列に接続する終端負荷１０２とを備え、電圧初期値保持部１０１が、データ信号の未入力時の電圧初期値を終端負荷１０２に出力し、終端負荷１０２の両端を直流成分で同電位とする。【選択図】 図１