TRANSMISSION CIRCUIT, DATA TRANSFER CONTROL UNIT, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a transmission circuit which is capable of stabilizing high- speed data transfer by a current drive, a data transfer control unit, and an electronic apparatus. SOLUTION: An HS current driver (transmission circuit) 50 included in a data transfer control unit comprises a current source 70 connected between a first power supply AVDD and a node ND and switching elements SW1 to SW3 whose one ends are connected to the node ND. The other end of the switching element SW1 is connected to a DP terminal 72. The other end of the switching element SW2 is connected to a DM terminal 74. The other end of the terminal SW3 is connected to a DA terminal 76. The DA terminal 76 is connected to a second power supply AVSS inside or outside the transmission circuit 50. When the switch elements SW1 to SW3 are all turned ON, the current paths from the node Nd to the switches elements SW1 to SW3 are so set as to be equivalent in impedance to each other, so that the node ND avoids increasing in voltage while no signal is transmitted.