HALF_FLASH_ADC

Published:2009/7/5 21:17:00 Author:May | From:SeekIC

An a/d conversion technique which combines some of the speed advantages of flash conversion with the circuitry savings of successive approximation is termed half-flash. In an 8-bit, half-flash converter, two 4-bit flash a/d sections are combined. The upper flash a/d compares the input signal to the reference and generates the upper 4 data bits. This data goes to an internal DAC, whose output is subtracted from the analog input. Then, the difference can be measured by the second flash a/d, which provides the lower 4 data bits.



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