Patent ID: 8384422

Claim:
A terminal resistance device comprising: a variable terminal resistance unit including a plurality of first terminal resistance elements connectable to a transmission path, and at least one second terminal resistance element connectable to the transmission path; and a terminal resistance control unit that transmits a first control signal of a thermometer code to the variable terminal resistance unit and a second control signal of a binary code to the variable terminal resistance unit, the first control signal being for selecting the first terminal resistance elements to be connected to the transmission path, the second control signal being for selecting the at least one second terminal resistance element to be connected to the transmission path, wherein the first terminal resistance elements have the same resistance value, wherein the at least one second terminal resistance element has a resistance value which is 2 n times a resistance value of each of the first terminal resistance elements so as to define a series of terminal resistance elements having respectively resistance values R and R*2 n (R represents the resistance value of the plural first terminal resistance elements having the same resistance value, n represents a positive or negative integer, and R*2 n represents the resistance value of the second terminal resistance element), and wherein the terminal resistance control unit comprises a binary code-thermometer code convert unit which converts a received binary code to the thermometer code.