SUCCESSIVE APPROXIMATION REGISTER ANALOG-TO-DIGITAL CONVERTER

摘要

Aspects of a method and apparatus for converting an analog input value to a digital output code are provided. One embodiment of the apparatus includes a digital-to-analog converter, a comparator, and control logic circuitry. The digital-to-analog converter is configured to generate an analog reference value based on a received digital reference value. The comparator is configured to compare an analog input value to the analog reference value after expiration of an allotted settling time for the digital-to-analog converter and generate a comparison result indicative a relationship between the analog input value and the analog reference value. The control logic circuitry is configured to select the allotted settling time for the digital-to-analog converter based on a bit position of a digital output code to be determined, and update the bit position of the digital output code based on the comparison result.

主权项

1. A method of converting an analog input value to a digital output code, comprising:
selecting a settling time for a digital-to-analog converter based on a bit position of the digital output code being determined; comparing an analog reference value generated by the digital-to-analog converter in response to expiration of the selected settling time for the digital-to-analog converter; and updating the bit position of the digital output code based on a comparison result of said comparing.