ASYNCHRONOUS ANALOG-TO-DIGITAL CONVERTER

摘要

An analog-to-digital converter (ADC) apparatus (200) has a comparison circuit (204) that receives an analog signal (AIN). A reference circuit (205) coupled to the comparison circuit provides a plurality of reference signals. A conversion circuit is coupled to the comparison circuit to detect a change in the output of the comparison circuit. A time-to-digital converter (TDC) (210) and a timer (208) are coupled to the comparison circuit. An output circuit (216) coupled to the conversion circuit and the TDC outputs at least one of a synchronous digital representation of the analog signal and an asynchronous digital representation of the analog signal. An analog-to-digital converter (ADC) (220) coupled to the conversion circuit, the timer, and the TDC is enabled by the timer when a predetermined period has lapsed.