Patent ID: 7864090

Claim:
An analog-to-digital converting apparatus comprising: a converting unit having an input terminal and an input-output characteristic, the input-output characteristic having temperature dependence, the converting unit being configured to carry out a process of converting an input voltage signal through the input terminal to digital data; a specified voltage applying unit configured to apply a specified voltage to the input terminal of the converting unit; a temperature determining unit having information representing a relationship between a variable of an output of the converting unit and a variable of a temperature around the converting unit according to the temperature dependence of the input-output characteristic of the converting unit, the temperature determining unit being configured to, when the specified voltage is applied to the input terminal of the converting unit, determine a value of the temperature around the converting unit based on the information and the specified voltage; and a reducing unit configured to reduce temperature dependence of the process of converting the input voltage signal to the digital data based on the determined value of the temperature around the converting unit.