Semiconductor integrated circuits

摘要

In a semiconductor integrated circuit (1), a digital-to-analogue converter (2) converts digital signals into analogue signals, and outputs differential analogue current signals respectively to positive and negative signal lines (AIP, AIN). A filter (4) filters differential analogue signals input through the positive and negative signal lines. A first resistance is connected between the positive signal line and a reference potential. A second resistance is connected between the negative signal line and the reference potential. The first and second resistances have the function of converting the current signals flowing on the positive and negative signal lines, into voltage signals, and the function of an electronic volume control for controlling the DC component levels of the voltage signals.