Half-flash-adc

  
An aid 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 aid sections are combined. The upper flash aid 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.
Half-flash-adc - schematic

Then, the difference can be measured by the second flash aid, which provides the lower 4 data bits.




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