Semiconductor integrated circuit for communication including analog-to-digital conversion circuit

Abstract

A semiconductor integrated circuit having a built-in A/D conversion circuit which enables, where the A/D conversion circuit is to be built into a semiconductor chip, the required capacitance of the stabilization capacitor to be connected to the output terminals of reference voltage generators for generating reference voltages to be reduced is to be provided to contribute to preventing the number of external terminals and the chip size from increasing. A semiconductor integrated circuit having a built-in differential type A/D conversion circuit comprising a differential amplifier, a local A/D converter and local D/A converters, further provided with a first reference voltage generator for generating a first reference voltage and a second reference voltage generator for generating a second reference voltage both for use by the local A/D converter, wherein the first reference voltage generator and the second reference voltage generator are provided as common reference voltage generators with a reference voltage generator for generating a first reference voltage and a second reference voltage both for use by the local D/A converters, and a capacitance element for stabilizing the generated reference voltages is connected between the output terminal of the first reference voltage generator and that of the second reference voltage generator.