Patent ID: 8860593

Claim:
A data processing system for obtaining an AD conversion result of an n (where n: positive integer) bit extension for the resolution of an AD converter, comprising: the AD converter; a programmable gain amplifier; and a control circuit, wherein the control circuit divides an input range of the AD converter by m (2 n ≦m), prepares a digital offset at which voltages at connection points of respective divided ranges are identical between the adjacent divided ranges, determines to which divided range an AD conversion result by the AD converter belongs with respect to an analog signal to be measured, amplifies an amp offset which defines a voltage range for each determined divided range as a voltage range for the input range of the AD converter by applying the amp offset and a designation of gain therefor to the programmable gain amplifier, converts the amplified signal by the AD converter, performs an n-bit extension and a division by actually measured gain of the programmable gain amplifier on a result of conversion thereof, and adds a corresponding digital offset of divided range to the conversion result, thereby obtaining an AD conversion result with a bit precision being n-bit extended.