| 摘要 |
A successive approximation ADC having a D/A converter (15), a comparator (10) which compares an input voltage to the output of the D/A converter (15), and a successive approximation cell (30) which iteratively feeds binary values to the D/A converter (15) and together with the comparator (10) determines a binary value for the input voltage. The successive approximation ADC is operated to function as a threshold detector by pausing operation of the successive approximation cell (30) and by inputting (36) a binary threshold value to the D/A converter (15) so that the comparator (10) compares the input voltage to the threshold voltage. Thus, a threshold detector is implemented using the existing circuitry, namely the D/A converter (15) and the comparator (10). Embodiments of an improved successive approximation ADC are disclosed which includes a control device and bi-directional data lines (36) implemented in the successive approximation cell (30). An electronic system is also disclosed employing the improved successive approximation ADC to monitor a device voltage relative to a threshold value for the device voltage. |
