AD CONVERSION CIRCUIT AND ERROR CORRECTING METHOD

AD CONVERSION CIRCUIT AND ERROR CORRECTING METHOD

In a microcomputer 10 which converts an analog signal Vin into digital data and corrects an error of the digital data, a voltage variation Vcc is calculated on the basis of a first conversion value obtained by AD-converting a reference voltage Vref by an AD converter 15 in a state that a standard po...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: OCHI NOBUCHIKA, IKEDA ATSUSHI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
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Beschreibung
Zusammenfassung:In a microcomputer 10 which converts an analog signal Vin into digital data and corrects an error of the digital data, a voltage variation Vcc is calculated on the basis of a first conversion value obtained by AD-converting a reference voltage Vref by an AD converter 15 in a state that a standard power source voltage including no voltage variation is supplied to the AD converter 15 and a second conversion value obtained by AD-converting the reference voltage Vref by the AD converting section in a state that a power source voltage for the ordinary operation is supplied to the AD converter 15. The digital data produced by the AD converter 15 by AD-converting the analog signal Vin is corrected using the calculated voltage variation Vcc.