Analog/digital converter with threshold test and conversion mode

Details Analog/digital converter with threshold test and conversion mode Analog/digital converter with threshold test and conversion mode

1998-02-03

2000-06-13

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

060754788

ABSTRACT:
A successive approximation analog/digital ("A/D") converter that converts an analog input voltage to a digital value for output in a manner enabling a reduction in power consumption. The A/D converter includes a comparator that outputs a referencing result signal by comparing an analog input voltage against a reference voltage. A D/A converter outputs the reference voltage to a comparator in correspondence to a digital voltage signal. A successive approximation register outputs the digital voltage signal to the D/A converter in correspondence to a conversion control signal. A conversion control device outputs the conversion control signal to the successive approximation register in correspondence to the referencing result signal to continue operation of the AND converter until the difference between the analog input voltage and the reference voltage converges to within a specific tolerance range. An output unit holds the digital voltage signal from the successive conversion register at a point in time at which the difference has converged to within the tolerance range and outputs the digital voltage signal as a digital output signal. An operating mode selection circuit judges an effective
on-effective state of the analog input voltage, enables an A/D conversion operation by entering a conversion mode when the analog input voltage is judged to be effective, and disables the A/D conversion operation by entering a standby mode when the analog input voltage is judged to be non-effective.

REFERENCES:
patent: 3153142 (1964-10-01), Helleman
patent: 4454500 (1984-06-01), Kato et al.

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