Patent Number: 7,786,918

Title: A/D conversion circuit and electronic instrument

Abstract: An A/D conversion circuit includes an amplifier circuit that includes a plurality of amplifiers that are cascaded, a selector that selects one of output signals output from the plurality of amplifiers and outputs the selected output signal as a selector output signal, an A/D converter that A/D-converts the selector output signal output from the selector, a determination circuit that determines whether or not a voltage of the output signal output from each of the plurality of amplifiers is within a determination voltage range specified by a high-potential-side determination voltage and a low-potential-side determination voltage, and a control circuit that instructs the selector to select one of the output signals output from the plurality of amplifiers based on the determination result of the determination circuit.

Inventors: Fukuzawa; Akihiro (Hino, JP), Imai; Nobuyuki (Shiojiri, JP), Ito; Satoru (Okaya, JP)

Assignee: Seiko Epson Corporation

International Classification: H03M 1/12 (20060101)

Expiration Date: 8/31/12018