JPS62164426U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram of a circuit showing an embodiment of this invention, and FIG. 2 is a block diagram showing a conventional circuit. In the figure, 1 is a voltage comparison type comparator, 2 is a successive approximation register, 3 is a reference voltage circuit, and 4 is a D/
A converter, 5 is a timing circuit, 6 is an offset circuit, 7 is a digital comparison type comparator, and 8 is an output signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Correction: May 12, 1982 The name of the invention is amended as follows. Name of invention: A/D conversion device

Claims (1)

[Scope of utility model registration request] The analog signal given from the outside is sent to the first D/
A first voltage comparison type comparator that compares the output voltage of the A converter, a second voltage comparison type comparator that compares the analog signal with the output voltage of the offset circuit, and the first and second voltage comparison type comparators. first and second successive approximation registers whose operation speeds are controlled by a timing circuit while inputting the output voltage of the first successive approximation register;
a second D/A converter and the first and second D/A converters;
The A/D conversion circuit includes a reference voltage circuit that supplies a reference voltage to the converter, and an offset circuit that offsets the output of the second D/A converter by a fixed value. An A/D conversion device comprising a digital comparator for comparing digital values of outputs of comparison resistors.